Switch to GH actions to build GH pages

.github/workflows/build+deploy.yml

@@ -0,0 +1,56 @@
+name: Build and Deploy Jekyll Site with Docker
+
+on:
+  push:
+    branches:
+      - '*' # Build on every branch
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out the code
+        uses: actions/checkout@v4
+
+      - name: Set UID and GID
+        run: |
+          echo "UID=$(id -u)" >> $GITHUB_ENV
+          echo "GID=$(id -g)" >> $GITHUB_ENV
+
+      - name: Build website with Jekyll (Docker)
+        env:
+          UID: ${{ env.UID }}
+          GID: ${{ env.GID }}
+        run: |
+          docker compose run --rm \
+            -v $(pwd):/srv/jekyll \
+            jekyll \
+            jekyll build
+
+      - name: Upload _site directory as artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: jekyll-site
+          path: ./_site
+
+  deploy:
+    if: github.ref == 'refs/heads/master' # Only run deployment on master branch
+    needs: build
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out the code
+        uses: actions/checkout@v4
+
+      - name: Download artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: jekyll-site
+
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v4
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./_site

.gitignore

@@ -5,7 +5,6 @@ _site
 .jekyll-metadata
 .bundle
 .sass-cache
-Gemfile.lock
 *.iml
 _rebuild-page*
 _start_server*

Dockerfile

@@ -0,0 +1,8 @@
+# Base image: Jekyll 4
+FROM jekyll/jekyll:4
+
+# Copy Gemfile and Gemfile.lock into the container
+COPY Gemfile Gemfile.lock ./
+
+# Install Ruby gems
+RUN bundle install

Gemfile

@@ -1,4 +1,7 @@
 source 'https://rubygems.org'
-raise 'Ruby should be >=2.0' unless RUBY_VERSION.to_f >= 2.0
-gem 'github-pages'
-gem "webrick", "~> 1.7"
+raise 'Ruby should be >=3.0' unless RUBY_VERSION.to_f >= 3.0
+gem "github-pages", group: :jekyll_plugins
+gem "webrick"
+group :jekyll_plugins do
+  gem "jekyll-last-modified-at"
+end

Gemfile.lock

@@ -0,0 +1,283 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    activesupport (7.2.2.1)
+      base64
+      benchmark (>= 0.3)
+      bigdecimal
+      concurrent-ruby (~> 1.0, >= 1.3.1)
+      connection_pool (>= 2.2.5)
+      drb
+      i18n (>= 1.6, < 2)
+      logger (>= 1.4.2)
+      minitest (>= 5.1)
+      securerandom (>= 0.3)
+      tzinfo (~> 2.0, >= 2.0.5)
+    addressable (2.8.7)
+      public_suffix (>= 2.0.2, < 7.0)
+    base64 (0.2.0)
+    benchmark (0.4.0)
+    bigdecimal (3.1.9)
+    coffee-script (2.4.1)
+      coffee-script-source
+      execjs
+    coffee-script-source (1.12.2)
+    colorator (1.1.0)
+    commonmarker (0.23.11)
+    concurrent-ruby (1.3.5)
+    connection_pool (2.5.0)
+    csv (3.3.2)
+    dnsruby (1.72.3)
+      base64 (~> 0.2.0)
+      simpleidn (~> 0.2.1)
+    drb (2.2.1)
+    em-websocket (0.5.3)
+      eventmachine (>= 0.12.9)
+      http_parser.rb (~> 0)
+    ethon (0.16.0)
+      ffi (>= 1.15.0)
+    eventmachine (1.2.7)
+    execjs (2.10.0)
+    faraday (2.12.2)
+      faraday-net_http (>= 2.0, < 3.5)
+      json
+      logger
+    faraday-net_http (3.4.0)
+      net-http (>= 0.5.0)
+    ffi (1.17.1-x86_64-linux-musl)
+    forwardable-extended (2.6.0)
+    gemoji (4.1.0)
+    github-pages (232)
+      github-pages-health-check (= 1.18.2)
+      jekyll (= 3.10.0)
+      jekyll-avatar (= 0.8.0)
+      jekyll-coffeescript (= 1.2.2)
+      jekyll-commonmark-ghpages (= 0.5.1)
+      jekyll-default-layout (= 0.1.5)
+      jekyll-feed (= 0.17.0)
+      jekyll-gist (= 1.5.0)
+      jekyll-github-metadata (= 2.16.1)
+      jekyll-include-cache (= 0.2.1)
+      jekyll-mentions (= 1.6.0)
+      jekyll-optional-front-matter (= 0.3.2)
+      jekyll-paginate (= 1.1.0)
+      jekyll-readme-index (= 0.3.0)
+      jekyll-redirect-from (= 0.16.0)
+      jekyll-relative-links (= 0.6.1)
+      jekyll-remote-theme (= 0.4.3)
+      jekyll-sass-converter (= 1.5.2)
+      jekyll-seo-tag (= 2.8.0)
+      jekyll-sitemap (= 1.4.0)
+      jekyll-swiss (= 1.0.0)
+      jekyll-theme-architect (= 0.2.0)
+      jekyll-theme-cayman (= 0.2.0)
+      jekyll-theme-dinky (= 0.2.0)
+      jekyll-theme-hacker (= 0.2.0)
+      jekyll-theme-leap-day (= 0.2.0)
+      jekyll-theme-merlot (= 0.2.0)
+      jekyll-theme-midnight (= 0.2.0)
+      jekyll-theme-minimal (= 0.2.0)
+      jekyll-theme-modernist (= 0.2.0)
+      jekyll-theme-primer (= 0.6.0)
+      jekyll-theme-slate (= 0.2.0)
+      jekyll-theme-tactile (= 0.2.0)
+      jekyll-theme-time-machine (= 0.2.0)
+      jekyll-titles-from-headings (= 0.5.3)
+      jemoji (= 0.13.0)
+      kramdown (= 2.4.0)
+      kramdown-parser-gfm (= 1.1.0)
+      liquid (= 4.0.4)
+      mercenary (~> 0.3)
+      minima (= 2.5.1)
+      nokogiri (>= 1.16.2, < 2.0)
+      rouge (= 3.30.0)
+      terminal-table (~> 1.4)
+      webrick (~> 1.8)
+    github-pages-health-check (1.18.2)
+      addressable (~> 2.3)
+      dnsruby (~> 1.60)
+      octokit (>= 4, < 8)
+      public_suffix (>= 3.0, < 6.0)
+      typhoeus (~> 1.3)
+    html-pipeline (2.14.3)
+      activesupport (>= 2)
+      nokogiri (>= 1.4)
+    http_parser.rb (0.8.0)
+    i18n (1.14.7)
+      concurrent-ruby (~> 1.0)
+    jekyll (3.10.0)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
+      csv (~> 3.0)
+      em-websocket (~> 0.5)
+      i18n (>= 0.7, < 2)
+      jekyll-sass-converter (~> 1.0)
+      jekyll-watch (~> 2.0)
+      kramdown (>= 1.17, < 3)
+      liquid (~> 4.0)
+      mercenary (~> 0.3.3)
+      pathutil (~> 0.9)
+      rouge (>= 1.7, < 4)
+      safe_yaml (~> 1.0)
+      webrick (>= 1.0)
+    jekyll-avatar (0.8.0)
+      jekyll (>= 3.0, < 5.0)
+    jekyll-coffeescript (1.2.2)
+      coffee-script (~> 2.2)
+      coffee-script-source (~> 1.12)
+    jekyll-commonmark (1.4.0)
+      commonmarker (~> 0.22)
+    jekyll-commonmark-ghpages (0.5.1)
+      commonmarker (>= 0.23.7, < 1.1.0)
+      jekyll (>= 3.9, < 4.0)
+      jekyll-commonmark (~> 1.4.0)
+      rouge (>= 2.0, < 5.0)
+    jekyll-default-layout (0.1.5)
+      jekyll (>= 3.0, < 5.0)
+    jekyll-feed (0.17.0)
+      jekyll (>= 3.7, < 5.0)
+    jekyll-gist (1.5.0)
+      octokit (~> 4.2)
+    jekyll-github-metadata (2.16.1)
+      jekyll (>= 3.4, < 5.0)
+      octokit (>= 4, < 7, != 4.4.0)
+    jekyll-include-cache (0.2.1)
+      jekyll (>= 3.7, < 5.0)
+    jekyll-last-modified-at (1.3.2)
+      jekyll (>= 3.7, < 5.0)
+    jekyll-mentions (1.6.0)
+      html-pipeline (~> 2.3)
+      jekyll (>= 3.7, < 5.0)
+    jekyll-optional-front-matter (0.3.2)
+      jekyll (>= 3.0, < 5.0)
+    jekyll-paginate (1.1.0)
+    jekyll-readme-index (0.3.0)
+      jekyll (>= 3.0, < 5.0)
+    jekyll-redirect-from (0.16.0)
+      jekyll (>= 3.3, < 5.0)
+    jekyll-relative-links (0.6.1)
+      jekyll (>= 3.3, < 5.0)
+    jekyll-remote-theme (0.4.3)
+      addressable (~> 2.0)
+      jekyll (>= 3.5, < 5.0)
+      jekyll-sass-converter (>= 1.0, <= 3.0.0, != 2.0.0)
+      rubyzip (>= 1.3.0, < 3.0)
+    jekyll-sass-converter (1.5.2)
+      sass (~> 3.4)
+    jekyll-seo-tag (2.8.0)
+      jekyll (>= 3.8, < 5.0)
+    jekyll-sitemap (1.4.0)
+      jekyll (>= 3.7, < 5.0)
+    jekyll-swiss (1.0.0)
+    jekyll-theme-architect (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-cayman (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-dinky (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-hacker (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-leap-day (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-merlot (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-midnight (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-minimal (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-modernist (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-primer (0.6.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-github-metadata (~> 2.9)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-slate (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-tactile (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-time-machine (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-titles-from-headings (0.5.3)
+      jekyll (>= 3.3, < 5.0)
+    jekyll-watch (2.2.1)
+      listen (~> 3.0)
+    jemoji (0.13.0)
+      gemoji (>= 3, < 5)
+      html-pipeline (~> 2.2)
+      jekyll (>= 3.0, < 5.0)
+    json (2.9.1)
+    kramdown (2.4.0)
+      rexml
+    kramdown-parser-gfm (1.1.0)
+      kramdown (~> 2.0)
+    liquid (4.0.4)
+    listen (3.9.0)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
+    logger (1.6.5)
+    mercenary (0.3.6)
+    minima (2.5.1)
+      jekyll (>= 3.5, < 5.0)
+      jekyll-feed (~> 0.9)
+      jekyll-seo-tag (~> 2.1)
+    minitest (5.25.4)
+    net-http (0.6.0)
+      uri
+    nokogiri (1.18.2-x86_64-linux-musl)
+      racc (~> 1.4)
+    octokit (4.25.1)
+      faraday (>= 1, < 3)
+      sawyer (~> 0.9)
+    pathutil (0.16.2)
+      forwardable-extended (~> 2.6)
+    public_suffix (5.1.1)
+    racc (1.8.1)
+    rb-fsevent (0.11.2)
+    rb-inotify (0.11.1)
+      ffi (~> 1.0)
+    rexml (3.4.0)
+    rouge (3.30.0)
+    rubyzip (2.4.1)
+    safe_yaml (1.0.5)
+    sass (3.7.4)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    sawyer (0.9.2)
+      addressable (>= 2.3.5)
+      faraday (>= 0.17.3, < 3)
+    securerandom (0.4.1)
+    simpleidn (0.2.3)
+    terminal-table (1.8.0)
+      unicode-display_width (~> 1.1, >= 1.1.1)
+    typhoeus (1.4.1)
+      ethon (>= 0.9.0)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    unicode-display_width (1.8.0)
+    uri (1.0.2)
+    webrick (1.9.1)
+
+PLATFORMS
+  x86_64-linux-musl
+
+DEPENDENCIES
+  github-pages
+  jekyll-last-modified-at
+  webrick
+
+BUNDLED WITH
+   2.3.25

_config.yml

@@ -3,7 +3,7 @@
 #
 
 # Name of your site (displayed in the header)
-name: Java User Group Darmstadt
+title: Java User Group Darmstadt
 
 # Short bio or description (displayed in the header)
 description: Community der Java Anwender in und um Darmstadt
@@ -78,9 +78,10 @@ sass:
 #  style: :expanded # You might prefer to minify using :compressed
 
 # Use the following plug-ins
-gems:
+plugins:
   - jekyll-sitemap # Create a sitemap using the official Jekyll sitemap gem
   - jemoji
+  - jekyll-last-modified-at
 
 # Exclude these files from your production _site
 exclude:
@@ -89,3 +90,4 @@ exclude:
     - LICENSE
     - README.md
     - CNAME
+    - .idea