Add Forgejo Actions workflow for build and deploy

Triggers on push to main: checks out repo with submodules,
installs Zola, builds the site, and deploys to skippy via rsync.

.forgejo/workflows/deploy.yml

@@ -0,0 +1,33 @@
+name: Build and Deploy
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: true
+
+      - name: Install Zola
+        run: |
+          ZOLA_VERSION="0.19.2"
+          wget -q "https://github.com/getzola/zola/releases/download/v${ZOLA_VERSION}/zola-v${ZOLA_VERSION}-x86_64-unknown-linux-gnu.tar.gz" -O /tmp/zola.tar.gz
+          tar -xzf /tmp/zola.tar.gz -C /usr/local/bin
+          zola --version
+
+      - name: Build
+        run: zola build
+
+      - name: Deploy via rsync
+        run: |
+          mkdir -p ~/.ssh
+          echo "${{ secrets.DEPLOY_SSH_KEY }}" > ~/.ssh/id_ed25519
+          chmod 600 ~/.ssh/id_ed25519
+          ssh-keyscan -H skippy.w5isp.com >> ~/.ssh/known_hosts
+          rsync -avz --delete public/ graham@skippy.w5isp.com:/home/graham/apps/w5isp.com/