introduce CI for deploying the styleguide based on ccchh-website CI

.forgejo/workflows/deploy.yaml

@@ -0,0 +1,35 @@
+on:
+  push:
+    branches:
+      - main
+
+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 ${{ github.ref_name }}"
+
+      - name: Install packages
+        run: |
+          apk update
+          # For CI actions.
+          apk add nodejs-current git
+          # For uploading.
+          apk add rsync openssh
+
+      - uses: actions/checkout@v4
+
+      - name: Prepare keys
+        run: |
+          echo "${{ secrets.SSH_DEPLOY_KEY }}" > deploykey.priv
+          chmod 400 deploykey.priv
+          echo "${{ secrets.SSH_KNOWN_HOSTS_FILE }}" > ./known_hosts
+
+      - name: Upload styleguide
+        if: (github.event_name == 'push' || github.event_name == 'schedule') && github.ref_name == 'main'
+        run: |
+          rsync -v -r --delete -e "ssh -i deploykey.priv -o 'UserKnownHostsFile ./known_hosts'" styleguide/ eh22-styleguide-deploy@eh22-wiki-intern.hamburg.ccc.de:/var/www/eh22-styleguide/