Enable arm docker build (Project-OSRM#6172)

This issue enables dockerX for multi-arch docker image building. 
Resulting images can be run on x86 and arm processors (for example aws graviton).

Author: nurikk

.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
@@ -34,10 +39,7 @@ jobs:
           images: ghcr.io/${{ github.repository }}
           flavor: |
             latest=true
-            suffix=-assertions,onlatest=true
-          
-
-
+            suffix=-assertions,onlatest=true        
 
       - name: Log in to GitHub Docker Registry
         uses: docker/login-action@v1
@@ -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: |

CHANGELOG.md

@@ -10,6 +10,7 @@
       - FIXED: Run all unit tests in CI [#5248](https://github.com/Project-OSRM/osrm-backend/pull/5248)
       - FIXED: Fix installation of Mason CMake and 32 bit CI build [#6170](https://github.com/Project-OSRM/osrm-backend/pull/6170)
       - FIXED: Fixed Node docs generation check in CI. [#6058](https://github.com/Project-OSRM/osrm-backend/pull/6058)
+      - CHANGED: Docker build, enabled arm64 build layer [#6172](https://github.com/Project-OSRM/osrm-backend/pull/6172)
       - CHANGED: Docker build, enabled apt-get update/install caching in separate layer for build phase [#6175](https://github.com/Project-OSRM/osrm-backend/pull/6175)
 
 # 5.26.0