Add tasks to set up SSH agent and publish installation

.github/workflows/staging.yml

@@ -1,10 +1,13 @@
-name: Deploy to Antville.org development environment
+name: Deploy to development environment
 
 on:
   workflow_dispatch
 
+env:
+  SSH_AUTH_SOCK: /tmp/ssh-agent.sock
+
 jobs:
-  build:
+  install:
     runs-on: ubuntu-latest
 
     environment:
@@ -25,3 +28,20 @@ jobs:
 
     - name: Build with Gradle
       run: ./gradlew installDist
+
+    - name: Set up SSH agent
+      run: |
+        ssh-agent -a $SSH_AUTH_SOCK > /dev/null
+        ssh-add - <<< "${{ secrets.SSH_PRIVATE_KEY }}"
+        mkdir -p ~/.ssh
+        echo '${{ vars.SSH_CONFIG }}' > ~/.ssh/config
+        echo '${{ vars.KNOWN_HOSTS }}' > ~/.ssh/known_hosts
+
+    - name: Publish to staging environment
+      run: |
+        rsync build/install/helma/ antville.dev:/ \
+          --verbose --archive --delete --compress \
+          --filter '+ launcher.jar' \
+          --filter '+ lib' \
+          --filter '+ *.jar' \
+          --filter '- *' \