add forgejo actions workflow for deploying the static website

.forgejo/workflows/deploy.yaml

@@ -0,0 +1,42 @@
+on:
+  push:
+    branches:
+      - main
+  schedule:
+    - cron: "0 0 * * *"
+  workflow_dispatch:
+
+env:
+  TZ: Europe/Berlin
+
+jobs:
+  build:
+    runs-on: docker
+    container:
+      image: alpine:latest
+    steps:
+      - name: Pipeline info
+        run: |
+          echo "Run triggered by ${{ github.event_name }} (${{ github.event.action }}) on ref ${{ github.ref_name }}"
+
+      - name: Install packages
+        run: |
+          apk update
+          # For CI actions.
+          apk add nodejs-current
+          # For website build.
+          apk add tzdata coreutils curl jq git
+          # For uploading.
+          apk add rsync openssh
+
+      - uses: actions/checkout@v4
+
+      - name: Deploy - Prepare keys
+        run: |
+          echo "${{ secrets.SSH_DEPLOY_KEY }}" > deploykey.priv
+          chmod 400 deploykey.priv
+          echo "${{ secrets.SSH_KNOWN_HOSTS_FILE }}" > ./known_hosts
+
+      - name: Deploy - Upload to prod
+        run: |
+          rsync -v -r --delete -e "ssh -i deploykey.priv -o 'UserKnownHostsFile ./known_hosts'" cpu.ccc.de/ cpuccc-website-deploy@public-web-static-intern.hamburg.ccc.de:/var/www/cpu.ccc.de/