Edit gitea action workflow to build and deploy kotlin app on production server.

.gitea/workflows/build-and-deploy.yml

@@ -9,7 +9,42 @@ jobs:
   build-and-deploy:
     runs-on: ubuntu-latest
     steps:
-      - name: Hello world
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Build backend docker image
         run: |
-          echo 'Hello world'
-          echo 'Done'
+          sudo /usr/bin/docker build -t gitea-workshop-app -f ./Dockerfile-backend . --no-cache
+
+      - name: Extract backend docker image into archive
+        run: |
+          sudo /usr/bin/docker save gitea-workshop-app:latest -o ./gitea-workshop-app.tar
+
+      - name: Transfer artifacts to remote server
+        env:
+          SSH_PRIVATE_KEY: ${{ secrets.PROD_SSH_PRIVATE_KEY }}
+          REMOTE_HOST: ${{ secrets.PROD_REMOTE_HOST }}
+          REMOTE_USER: ${{ secrets.PROD_REMOTE_USER }}
+          REMOTE_PORT: ${{ secrets.PROD_REMOTE_PORT }}
+          REMOTE_PATH: ${{ secrets.PROD_REMOTE_PATH }}
+        run: |
+          mkdir -p ~/.ssh
+          echo "$SSH_PRIVATE_KEY" > ~/.ssh/id_rsa
+          chmod 400 ~/.ssh/id_rsa
+          scp -P $REMOTE_PORT ./gitea-workshop-app.tar $REMOVE_USER@$REMOTE_HOST:$REMOTE_PATH
+          scp -P $REMOTE_PORT ./docker-compose.yml $REMOVE_USER@$REMOTE_HOST:$REMOTE_PATH
+
+      - name: Launch application onto remote server
+        env:
+          SSH_PRIVATE_KEY: ${{ secrets.PROD_SSH_PRIVATE_KEY }}
+          REMOTE_HOST: ${{ secrets.PROD_REMOTE_HOST }}
+          REMOTE_USER: ${{ secrets.PROD_REMOTE_USER }}
+          REMOTE_PORT: ${{ secrets.PROD_REMOTE_PORT }}
+          REMOTE_PATH: ${{ secrets.PROD_REMOTE_PATH }}
+        run: |
+          ssh $REMOTE_HOST -l £REMOTE_USER -p $REMOTE_PORT << EOC
+            cd $REMOTE_PATH
+            sudo /usr/bin/docker load < $REMOTE_PATH/gitea-workshop-app.tar
+            sudo /usr/bin/docker compose down
+            sudo /usr/bin/docker compose up --detach
+          EOC