feat: update workflows

* build images with automatic tags
* separate staging and production deployment
* reuse workflows

.github/workflows/production.yml

@@ -0,0 +1,27 @@
+name: Production Deployment
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  ci-checks:
+    uses: ./.github/workflows/ci-checks.yml
+
+  build:
+    needs: ci-checks
+    uses: ./.github/workflows/build.yml
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: SSH into server and update service
+        uses: appleboy/ssh-action@master
+        with:
+          host: ${{ secrets.SERVER_HOST }}
+          port: ${{ secrets.SERVER_PORT }}
+          username: ${{ secrets.SERVER_USER }}
+          key: ${{ secrets.SERVER_SSH_KEY }}