[ci] Multiarch build. Fix dockerfile.

.github/workflows/build-image.yml

@@ -6,11 +6,7 @@ on:
 jobs:
   docker:
     name: Build Docker image 
-    
-    strategy:
-      matrix: 
-        arch: ['amd64', 'arm64']
-    
+       
     runs-on: ubuntu-latest
     steps:
       -
@@ -39,7 +35,7 @@ jobs:
         with:
           context: .
           file: docker/Dockerfile.${{ matrix.arch }}
-          platforms: linux/${{ matrix.arch }}
+          platforms: linux/amd64,linux/arm64
           push: ${{ github.ref == 'refs/heads/dev' }}
           tags: ${{ secrets.REGISTRY_URL }}/west/telegram-bot:latest,
               ${{ secrets.REGISTRY_URL }}/west/telegram-bot:${{ steps.commit_sha.outputs.sha_short }}