CI: add debug job to check context variables

.gitea/workflows/ci.yml

@@ -39,6 +39,17 @@ jobs:
         env:
           NODE_OPTIONS: "--max-old-space-size=4096"
 
+  debug-context:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Show context variables
+        run: |
+          echo "github.ref=${{ github.ref }}"
+          echo "github.ref_name=${{ github.ref_name }}"
+          echo "github.event_name=${{ github.event_name }}"
+          echo "github.repository=${{ github.repository }}"
+          echo "github.sha=${{ github.sha }}"
+
   deploy:
     if: github.ref == 'refs/heads/main' && github.event_name == 'push'
     needs: [test-and-build]