Improve docker workflow

.github/workflows/docker.yml

@@ -1,16 +1,73 @@
-name: Build Docker Images
+name: Publish Docker Images
 
 on:
   release:
     types:
       - released
-  workflow_dispatch:
-    inputs:
-      tag:
-        description: "The tag version you want to build"
+      - prereleased
+
+env:
+  REGISTRY_IMAGE: ghcr.io/sagernet/sing-box
+
 jobs:
   build:
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        platform:
+          - linux/amd64
+          - linux/arm/v6
+          - linux/arm/v7
+          - linux/arm64
+          - linux/386
+          - linux/ppc64le
+          - linux/riscv64
+          - linux/s390x
+    steps:
+      - name: Checkout
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
+        with:
+          ref: ${{ steps.ref.outputs.ref }}
+      - name: Prepare
+        run: |
+          platform=${{ matrix.platform }}
+          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
+      - name: Setup QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Setup Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push by digest
+        id: build
+        uses: docker/build-push-action@v6
+        with:
+          platforms: ${{ matrix.platform }}
+          context: .
+          build-args: |
+            BUILDKIT_CONTEXT_KEEP_GIT_DIR=1
+          outputs: type=image,name=${{ env.REGISTRY_IMAGE }},push-by-digest=true,name-canonical=true,push=true
+      - name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ env.PLATFORM_PAIR }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+  merge:
+    runs-on: ubuntu-latest
+    needs:
+      - build
     steps:
       - name: Get commit to build
         id: ref
@@ -29,34 +86,28 @@ jobs:
           fi
           echo "latest=$latest"
           echo "latest=$latest" >> $GITHUB_OUTPUT
-      - name: Checkout
-        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
+      - name: Download digests
+        uses: actions/download-artifact@v4
         with:
-          ref: ${{ steps.ref.outputs.ref }}
+          path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
-      - name: Setup QEMU for Docker Buildx
-        uses: docker/setup-qemu-action@v3
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Docker metadata
-        id: metadata
-        uses: docker/metadata-action@v5
-        with:
-          images: ghcr.io/sagernet/sing-box
-      - name: Build and release Docker images
-        uses: docker/build-push-action@v6
-        with:
-          platforms: linux/386,linux/amd64,linux/arm64,linux/s390x
-          context: .
-          target: dist
-          build-args: |
-            BUILDKIT_CONTEXT_KEEP_GIT_DIR=1
-          tags: |
-            ghcr.io/sagernet/sing-box:${{ steps.ref.outputs.latest }}
-            ghcr.io/sagernet/sing-box:${{ steps.ref.outputs.ref }}
-          push: true
+      - name: Create manifest list and push
+        working-directory: /tmp/digests
+        run: |
+          docker buildx imagetools create \
+            -t "${{ env.REGISTRY_IMAGE }}:${{ steps.ref.outputs.latest }}" \
+            -t "${{ env.REGISTRY_IMAGE }}:${{ steps.ref.outputs.ref }}" \
+            $(printf '${{ env.REGISTRY_IMAGE }}@sha256:%s ' *)
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ steps.ref.outputs.latest }}
+          docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ steps.ref.outputs.ref }}