Add CD

.github/workflows/cd-build-push-deploy.yaml

@@ -0,0 +1,46 @@
+name: Publish Docker image
+
+on:
+  push:
+    branches: [ "main" ]
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+      attestations: write
+      id-token: write
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v4
+
+      - name: Set short git commit SHA
+        id: vars
+        run: |
+          calculatedSha=$(git rev-parse --short ${{ github.sha }})
+          echo "COMMIT_SHORT_SHA=$calculatedSha" >> $GITHUB_ENV
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Build and push Docker image
+        id: push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./docker/backend/Dockerfile
+          push: true
+          tags: |
+            vaniog/queuehere:latest
+            vaniog/queuehere:${{ env.COMMIT_SHORT_SHA }}
+            
+      - name: Trigger watchtower to update container(s)
+        shell: bash
+        run: |
+          curl -H "Authorization: Bearer ${{ secrets.WATCHTOWER_HTTP_API_TOKEN }}" ${{ secrets.WATCHTOWER_UPDATE_ENDPOINT }}