Add multi-platform build job

This change adds a new build job that allows building a multi-platform
image.

.github/workflows/build.yaml

@@ -30,6 +30,11 @@ on:
         type: string
         default: 'non-prod'
         description: 'Runner type'
+      multiplatform:
+        required: false
+        type: boolean
+        default: false
+        description: 'Multiplatform build'
 
     secrets:
       API_TOKEN_GITHUB:
@@ -45,6 +50,7 @@ on:
 jobs:
   release:
     name: Build Docker
+    if: ${{ ! inputs.multiplatform }}
     runs-on: ${{ inputs.runner }}
     steps:
     - name: Setup | Checkout
@@ -64,3 +70,115 @@ jobs:
         registry: ${{ inputs.registry }}
         target: ${{ inputs.docker_target }}
         file: ${{ inputs.dockerfile_path }}
+
+  mp-build:
+    name: Build multiplatform Image (${{ matrix.platform }})
+    if: ${{ inputs.multiplatform }}
+    runs-on: [ "self-hosted", "${{ matrix.runs_on }}" ]
+    strategy:
+      fail-fast: false
+      matrix:
+        platform: [ "amd64", "arm64" ]
+        include:
+          - platform: amd64
+            runs_on: dev-us-east-1
+          - platform: arm64
+            runs_on: arm64
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Prepare
+        run: |
+          platform_slash_pair=linux/${{ matrix.platform }}
+          echo "PLATFORM_DASH_PAIR=${platform_slash_pair//\//-}" >> $GITHUB_ENV          
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY_IMAGE }}
+          tags: |
+            type=raw,value=${{ inputs.tags }}
+      
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Configure AWS credentials
+        uses: aws-actions/configure-aws-credentials@v1
+        with:
+          aws-access-key-id: ${{ secrets.ORG_AWS_ACCESS_KEY_ID }}
+          aws-secret-access-key: ${{ secrets.ORG_AWS_SECRET_ACCESS_KEY }}
+          aws-region: us-east-1
+
+      - name: Login to Amazon ECR
+        uses: aws-actions/amazon-ecr-login@v2
+
+      - name: Build and push by digest
+        id: build
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: linux/${{ matrix.platform }}
+          labels: ${{ steps.meta.outputs.labels }}
+          outputs: type=image,name=${{ env.REGISTRY_IMAGE }},push-by-digest=true,name-canonical=true,push=true
+
+      - name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"          
+      
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ env.PLATFORM_PAIR }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  merge:
+    runs-on: ${{ inputs.runner }}
+    needs:
+      - mp-build
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY_IMAGE }}
+          tags: |
+            type=raw,value=${{ inputs.tags }}
+      
+      - name: Configure AWS credentials
+        uses: aws-actions/configure-aws-credentials@v1
+        with:
+          aws-access-key-id: ${{ secrets.ORG_AWS_ACCESS_KEY_ID }}
+          aws-secret-access-key: ${{ secrets.ORG_AWS_SECRET_ACCESS_KEY }}
+          aws-region: us-east-1
+
+      - name: Login to Amazon ECR
+        uses: aws-actions/amazon-ecr-login@v2
+
+      - name: Create manifest list and push
+        working-directory: /tmp/digests
+        run: |
+          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+            $(printf '${{ env.REGISTRY_IMAGE }}@sha256:%s ' *)          
+      
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ inputs.tags }}