Adding tmate for debugging

Author: waja

.github/workflows/build.yml

@@ -2,6 +2,12 @@ name: build
 
 on:
   workflow_dispatch:
+    inputs:
+      debug_enabled:
+        type: boolean
+        description: 'Run the build with tmate debugging enabled (https://github.com/marketplace/actions/debugging-with-tmate)'
+        required: false
+        default: false
   push:
     branches:
       - master
@@ -70,6 +76,11 @@ jobs:
           tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:test
           context: .
 
+      # Enable tmate debugging of manually-triggered workflows if the input option was provided
+      - name: Setup tmate session
+        uses: mxschmitt/action-tmate@v3
+        if: ${{ github.event_name == 'workflow_dispatch' && inputs.debug_enabled }}
+
       - name: Test Docker image
         id: test-image
         run: |