add multiplatform support

Author: joao-zanutto

.github/workflows/docker.yml

@@ -15,6 +15,13 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v3
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+
+
     - name: Log in to Docker Hub
       uses: docker/login-action@v3
       with:
@@ -26,4 +33,5 @@ jobs:
       with:
         push: true
         tags: ghcr.io/${{ github.repository }}:latest,ghcr.io/${{ github.repository }}:${{ github.ref_name }}
+        platforms: linux/amd64,linux/arm64