Add CI

Author: qu35t-code

Diff for: .github/workflows/ci.yml

@@ -0,0 +1,30 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.13'
+
+      - name: Install package with pipx
+        run: |
+          python3 -m pip install --user pipx
+          python3 -m pipx ensurepath
+          pipx install .
+
+      - name: Execute test command with pipx
+        run: |
+          gpp-decrypt.py -f ./groups.xml