add Forgejo Actions workflow for deploying website and staging for PRs

.forgejo/workflows/deploy.yaml

@@ -0,0 +1,61 @@
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+env:
+  TZ: Europe/Berlin
+
+jobs:
+  build:
+    runs-on: docker
+    container:
+      image: docker.io/library/alpine
+    steps:
+      - name: Pipeline info
+        run: |
+          echo "Run triggered by ${{ github.event_name }} (${{ github.event.action }}) on ref ${{ github.ref_name }}"
+
+      - name: Install packages
+        run: |
+          apk update
+          # For CI actions.
+          apk add nodejs-current git curl
+          # For uploading.
+          apk add rsync openssh
+
+      - uses: actions/checkout@v4
+
+      - name: Deploy - Prepare keys
+        if: github.event_name == 'push' || github.event_name == 'pull_request'
+        run: |
+          echo "${{ secrets.SSH_DEPLOY_KEY }}" > deploykey.priv
+          chmod 400 deploykey.priv
+          echo "${{ secrets.SSH_KNOWN_HOSTS_FILE }}" > ./known_hosts
+
+      - name: Deploy - Upload PR to staging
+        if: github.event_name == 'pull_request'
+        run: |
+          echo "Deploying to staging.c3cat.de/pr${{ github.event.pull_request.number }}"
+          rsync -v -r --delete -e "ssh -i deploykey.priv -o 'UserKnownHostsFile ./known_hosts'" ./ c3cat-website-deploy@public-web-static-intern.hamburg.ccc.de:/var/www/staging.c3cat.de/pr${{ github.event.pull_request.number }}/
+      - name: Deploy - Add comment to PR with staging URL
+        if: github.event_name == 'pull_request' && github.event.action == 'opened'
+        run: |
+          curl \
+            -X POST \
+            ${{ github.event.pull_request.base.repo.url }}/issues/${{ github.event.pull_request.number }}/comments \
+            -H "Content-Type: application/json" \
+            -H "Authorization: token $GITHUB_TOKEN" \
+            --data '{ "body": "You can view your changes at https://staging.c3cat.de/pr${{ github.event.pull_request.number }}/" }'
+
+      - name: Deploy - Upload to prod
+        if: github.event_name == 'push' && github.ref_name == 'main'
+        run: |
+          rsync -v -r --delete -e "ssh -i deploykey.priv -o 'UserKnownHostsFile ./known_hosts'" ./ c3cat-website-deploy@public-web-static-intern.hamburg.ccc.de:/var/www/c3cat.de/
+
+      - uses: actions/upload-artifact@v3
+        if: github.event_name == 'pull_request'
+        with:
+          name: website-build
+          path: ./