Use GitHub cache for multi-stage caching

refs:
- docker/build-push-action#406
- https://github.com/docker/build-push-action/blob/master/docs/advanced/cache.md#github-cache

.github/workflows/ci-dev.yml

@@ -48,8 +48,8 @@ jobs:
         with:
           platforms: ${{ env.BUILD_PLATFORMS }}
           push: true
-          cache-from: type=registry,ref=ghcr.io/cheyilin/wrk:dev
-          cache-to: type=registry,ref=ghcr.io/cheyilin/wrk:dev,mode=max
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
           labels: ${{ steps.meta.outputs.labels }}
           tags: |
             ${{ steps.meta.outputs.tags }}