Create buildx image

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

.github/workflows/build.yml

@@ -12,6 +12,7 @@ on:
       - 'master'
 
 env:
+  REPO_SLUG: "docker/buildx-bin"
   REPO_SLUG_ORIGIN: "moby/buildkit:master"
   CACHEKEY_BINARIES: "binaries"
   PLATFORMS: "linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/s390x,linux/ppc64le,linux/riscv64"
@@ -173,6 +174,38 @@ jobs:
           name: buildx
           path: ./release-out/*
           if-no-files-found: error
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      -
+        name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: |
+            ${{ env.REPO_SLUG }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+      -
+        name: Login to DockerHub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Build and push image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          target: binaries
+          push: ${{ github.event_name != 'pull_request' }}
+          cache-from: type=local,src=/tmp/.buildx-cache/${{ env.CACHEKEY_BINARIES }}
+          platforms: ${{ env.PLATFORMS }},darwin/amd64,darwin/arm64,windows/amd64,windows/arm64
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
       -
         name: GitHub Release
         if: startsWith(github.ref, 'refs/tags/v')