Add multi-platform build in workflow (#419)

.github/workflows/cd.yml

@@ -2,7 +2,7 @@ name: Create and publish a Docker image
 
 on:
   push:
-    tags: 
+    tags:
       - '*'
 
 jobs:
@@ -15,28 +15,29 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
-        
+
       - name: Login to Github Container Registry
         uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-          
+
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
-        
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
       - name: Downcase repo
         run: |
           echo "REPO=${GITHUB_REPOSITORY@L}" >> "${GITHUB_ENV}"
-        
+
       - name: Build and push
         uses: docker/build-push-action@v6
         with:
           context: .
+          platforms: linux/amd64,linux/arm64
           push: true
           tags: |
             ghcr.io/${{ env.REPO }}:${{ github.ref_name }}