add sample CI workflow

.forgejo/workflows/ci.yml

@@ -0,0 +1,27 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: docker
+    steps:
+      - uses: https://code.forgejo.org/actions/checkout@v4
+
+      - name: Show environment
+        run: |
+          echo "Node version: $(node --version)"
+          echo "NPM version: $(npm --version)"
+          echo "Working directory: $(pwd)"
+          ls -la
+
+      - name: Run a test
+        run: |
+          echo "Hello from Forgejo Actions!"
+          echo "Repository: $GITHUB_REPOSITORY"
+          echo "Branch: $GITHUB_REF_NAME"
+          echo "CI is working!"