Add arm64 and use build cache

.gitea/workflows/release-container.yml

@@ -17,16 +17,25 @@ jobs:
         run: |
           echo "IMAGE=git.dou.bet/iamdoubz/drawit" >> $GITHUB_ENV
           echo "TAG=${GITHUB_REF_NAME}" >> $GITHUB_ENV
+          echo "CACHE_IMAGE=git.dou.bet/iamdoubz/drawit:buildcache" >> $GITHUB_ENV
 
       - name: Login to registry
         run: |
           echo "${{ secrets.REGISTRY_TOKEN }}" | docker login git.dou.bet -u "${{ secrets.REGISTRY_USER }}" --password-stdin
 
-      - name: Build image
-        run: |
-          docker build -t $IMAGE:$TAG -t $IMAGE:latest .
+      - name: Install QEMU
+        uses: docker/setup-qemu-action@v3
 
-      - name: Push image
+      - name: Install Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and push multi-arch image
         run: |
-          docker push $IMAGE:$TAG
-          docker push $IMAGE:latest
+          docker buildx build \
+            --platform linux/amd64,linux/arm64 \
+            --tag $IMAGE:$TAG \
+            --tag $IMAGE:latest \
+            --cache-from type=registry,ref=$CACHE_IMAGE \
+            --cache-to type=registry,ref=$CACHE_IMAGE,mode=max \
+            --push \
+            .