Enable arm docker build

.github/workflows/osrm-backend-docker.yml

@@ -11,6 +11,11 @@ jobs:
       - name: Check out the repo
         uses: actions/checkout@v2
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
 
       - name: Docker meta
         id: meta
@@ -36,9 +41,6 @@ jobs:
             latest=true
             suffix=-assertions,onlatest=true        
 
-
-
-
       - name: Log in to GitHub Docker Registry
         uses: docker/login-action@v1
         with:
@@ -46,16 +48,11 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-
-
-
-
-
-
       - name: Build container image - debug
         uses: docker/build-push-action@v2
         with:
           push: true
+          platforms: linux/amd64,linux/arm64
           file: ./docker/Dockerfile
           tags: ${{ steps.metadebug.outputs.tags  }}
           build-args: |
@@ -66,6 +63,7 @@ jobs:
         uses: docker/build-push-action@v2
         with:
           push: true
+          platforms: linux/amd64,linux/arm64
           file: ./docker/Dockerfile
           tags: ${{ steps.metaassertions.outputs.tags  }}
           build-args: |
@@ -76,6 +74,7 @@ jobs:
         uses: docker/build-push-action@v2
         with:
           push: true
+          platforms: linux/amd64,linux/arm64
           file: ./docker/Dockerfile
           tags:  ${{ steps.meta.outputs.tags  }}
           build-args: |