feat: enable arm64 platform

.forgejo/workflows/build.yml

@@ -45,6 +45,8 @@ jobs:
           HOSTNAME="${SERVER_URL#https://}"
           echo "Hostname: HOSTNAME"
           echo "DOCKER_REGISTRY_HOST=$HOSTNAME" >> "$GITHUB_ENV"
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
       - name: Login to Forgejo Registry
         uses: docker/login-action@v3
         with:
@@ -54,6 +56,7 @@ jobs:
       - name: Build and push
         uses: docker/build-push-action@v6
         with:
+          platforms: linux/amd64,linux/arm64
           context: ./images/${{ matrix.images.name }}/${{ matrix.images.tag }}
           push: true
           tags: ${{ env.DOCKER_REGISTRY_HOST }}/${{ github.repository_owner }}/${{ matrix.images.name }}:${{ matrix.images.tag }}