Added a deploy step

.forgejo/workflows/deploy.yml

@@ -0,0 +1,23 @@
+on:
+  push:
+    branches:
+      - main
+jobs:
+  deploy:
+    runs-on: docker
+    container:
+      image: forgejo.zenerdio.de/sebastian/c3space-website-ci:v0.1.0
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
+        with:
+          path: |
+            virtenv
+            cache
+            output
+          key: c3space-nikola-${{ github.ref_name }}
+      - run: python3 -m venv virtenv
+      - run: . virtenv/bin/activate; pip install -r requirements.txt
+      - run: . virtenv/bin/activate; nikola build
+      - run: echo "${{ secrets.DEPLOY_KEY }}" > id_rsa_deploy; chmod 600 id_rsa_deploy
+      - run: cd output; echo "cd public_html\nput -r ." | sftp -i ../id_rsa_deploy -o StrictHostKeyChecking=no c3space@zero-gravitas.zenerdio.de