add docker build step

.github/workflows/build_docker.yml

@@ -0,0 +1,129 @@
+name: Build Docker Image
+
+on:
+  workflow_call:
+    outputs:
+      client_image_tag:
+        description: "The tag of the client image that was built"
+        value: ${{ jobs.build.outputs.client_image_tag }}
+      application_server_image_tag:
+        description: "The tag of the application server image that was built"
+        value: ${{ jobs.build.outputs.application_server_image_tag }}
+      webhook_listener_image_tag:
+        description: "The tag of the webhook listener image that was built"
+        value: ${{ jobs.build.outputs.webhook_listener_image_tag }}
+
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - dockerfile: ./client/Dockerfile
+            image: ghcr.io/ls1intum/helios/client
+            context: ./client
+            path: client
+          - dockerfile: ./server/application-server/Dockerfile
+            image: ghcr.io/ls1intum/helios/application-server
+            context: ./server/application-server
+            path: server
+          - dockerfile: ./server/webhook-listener/Dockerfile
+            image: ghcr.io/ls1intum/helios/webhook-listener
+            context: ./server/webhook-listener
+            path: webhook-listener
+    outputs:
+      client_image_tag: "${{ steps.output-tag-client.outputs.client_image_tag }}"
+      application_server_image_tag: "${{ steps.output-tag-server.outputs.application_server_image_tag }}"
+      webhook_listener_image_tag: "${{ steps.output-tag-webhook-listener.outputs.webhook_listener_image_tag }}"
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Get changed files in the client folder
+        id: changed-files-client-folder
+        uses: tj-actions/changed-files@v45
+        with:
+          files: client/**
+
+      - name: Get changed files in the application server folder
+        id: changed-files-application-server-folder
+        uses: tj-actions/changed-files@v45
+        with:
+          files: server/application-server/**
+
+      - name: Get changed files in the webhook listener folder
+        id: changed-files-webhook-listener-folder
+        uses: tj-actions/changed-files@v45
+        with:
+          files: server/webhook-listener/**
+
+      - name: Log in to the Container registry
+        if: ${{ (steps.changed-files-client-folder.outputs.any_changed == 'true') || (steps.changed-files-application-server-folder.outputs.any_changed == 'true') || (steps.changed-files-webhook-listener-folder.outputs.any_changed == 'true') }}
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set up QEMU
+        if: ${{ (steps.changed-files-client-folder.outputs.any_changed == 'true') || (steps.changed-files-application-server-folder.outputs.any_changed == 'true') || (steps.changed-files-webhook-listener-folder.outputs.any_changed == 'true') }}
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: all
+
+      - name: Install Docker Buildx
+        if: ${{ (steps.changed-files-client-folder.outputs.any_changed == 'true') || (steps.changed-files-application-server-folder.outputs.any_changed == 'true') || (steps.changed-files-webhook-listener-folder.outputs.any_changed == 'true') }}
+        id: buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ matrix.image }}
+          tags: |
+            # Apply 'latest' tag for default branch
+            type=raw,value=latest,enable={{is_default_branch}}
+            # Apply 'latest' tag for a specific branch (e.g., staging)
+            # TODO: remove below
+            type=raw,value=latest,enable=${{ github.ref_name == '66-setup-helios-deployment' }}
+            type=ref,event=branch
+            type=ref,event=pr
+
+      - name: Build and push Docker Image
+        uses: docker/build-push-action@v6
+        if: ${{ (steps.changed-files-client-folder.outputs.any_changed == 'true' && matrix.path == 'client') || (steps.changed-files-application-server-folder.outputs.any_changed == 'true' && matrix.path == 'server') || (steps.changed-files-webhook-listener-folder.outputs.any_changed == 'true' && matrix.path == 'webhook-listener') }}
+        with:
+          context: ${{ matrix.context }}
+          file: ${{ matrix.dockerfile }}
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+
+      - id: output-tag-client
+        run: |
+          if [[ "${{ matrix.path }}" == "client" ]] && [[ "${{ steps.changed-files-client-folder.outputs.any_changed }}" == "true" ]]; then
+            echo "client_image_tag=${{ steps.meta.outputs.version }}" >> "$GITHUB_OUTPUT"
+          elif [[ "${{ matrix.path }}" == "client" ]]; then
+            echo "client_image_tag=latest" >> "$GITHUB_OUTPUT"
+          fi
+
+      - id: output-tag-application-server
+        run: |
+          if [[ "${{ matrix.path }}" == "server" ]] && [[ "${{ steps.changed-files-application-server-folder.outputs.any_changed }}" == "true" ]]; then
+            echo "application_server_image_tag=${{ steps.meta.outputs.version }}" >> "$GITHUB_OUTPUT"
+          elif [[ "${{ matrix.path }}" == "server" ]]; then
+            echo "application_server_image_tag=latest" >> "$GITHUB_OUTPUT"
+          fi
+
+      - id: output-tag-webhook-listener
+        run: |
+          if [[ "${{ matrix.path }}" == "webhook-listener" ]] && [[ "${{ steps.changed-files-webhook-listener-folder.outputs.any_changed }}" == "true" ]]; then
+            echo "webhook_listener_image_tag=${{ steps.meta.outputs.version }}" >> "$GITHUB_OUTPUT"
+          elif [[ "${{ matrix.path }}" == "webhook-listener" ]]; then
+            echo "webhook_listener_image_tag=latest" >> "$GITHUB_OUTPUT"
+          fi

.github/workflows/prod.yml

@@ -0,0 +1,24 @@
+name: Build and Deploy to Prod
+
+on:
+  push:
+    branches:
+      - main
+      # TODO: remove below
+      - 66-setup-helios-deployment
+
+jobs:
+  build-prod-container:
+    uses: ./.github/workflows/build_docker.yml
+    secrets: inherit
+#  deploy-prod-container:
+#    needs:
+#      - run-tests
+#      - build-prod-container
+#    uses: ./.github/workflows/deploy_docker.yml
+#    secrets: inherit
+    with:
+      environment: production
+      client_image_tag: "${{ needs.build-prod-container.outputs.client_image_tag }}"
+      application_server_image_tag: "${{ needs.build-prod-container.outputs.application_server_image_tag }}"
+      webhook_listener_image_tag: "${{ needs.build-prod-container.outputs.webhook_listener_image_tag }}"