ci: parallel multiarch build (#130)

Author: x1unix

.github/workflows/release.yml

@@ -18,6 +18,9 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        platform: [ linux/amd64, linux/arm64 ]
     steps:
       - uses: actions/checkout@v3
       - uses: actions/cache@v2
@@ -52,14 +55,15 @@ jobs:
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
       - name: Set up Docker Buildx
-        id: buildx
+        if: ${{ matrix.platform != 'linux/amd64' }}
         uses: docker/setup-buildx-action@v1
-      - name: Build and push image
+        id: buildx
+      - name: Build and push image (${{ matrix.platform }})
         uses: docker/build-push-action@v2
         with:
           context: .
           file: ./build/Dockerfile
-          platforms: linux/amd64,linux/arm64
+          platforms: ${{ matrix.platform }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           build-args: |