ci: use docker github builder to build the image

.github/workflows/build.yml

@@ -4,6 +4,10 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+# https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#permissions
+permissions:
+  contents: read
+
 on:
   workflow_dispatch:
   push:
@@ -134,42 +138,28 @@ jobs:
       allow-failure: ${{ matrix.allow-failure }}
 
   build:
-    runs-on: ubuntu-latest
+    uses: docker/github-builder-experimental/.github/workflows/bake.yml@8fc70909404a502fd0eca6601b99b32fa7192b03
+    permissions:
+      contents: read # same as global permission
+      id-token: write # for signing attestation(s) with GitHub OIDC Token
     needs:
       - validate
       - test
-    steps:
-      -
-        name: Login to DockerHub
-        if: github.event_name != 'pull_request'
-        uses: docker/login-action@v3
-        with:
+    with:
+      runner: amd64
+      target: xx-all
+      output: image
+      push: ${{ github.event_name != 'pull_request' }}
+      set-meta-labels: true
+      meta-images: |
+        tonistiigi/xx
+      meta-tags: |
+        type=ref,event=branch
+        type=ref,event=pr
+        type=semver,pattern={{version}}
+      meta-bake-target: meta-helper
+    secrets:
+      registry-auths: |
+        - registry: docker.io
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
-      -
-        name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-      -
-        name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-      -
-        name: Docker meta
-        id: meta
-        uses: docker/metadata-action@v5
-        with:
-          images: |
-            tonistiigi/xx
-          tags: |
-            type=ref,event=branch
-            type=ref,event=pr
-            type=semver,pattern={{version}}
-          bake-target: meta-helper
-      -
-        name: Build
-        uses: docker/bake-action@v6
-        with:
-          files: |
-            ./docker-bake.hcl
-            cwd://${{ steps.meta.outputs.bake-file }}
-          targets: xx-all
-          push: ${{ github.event_name != 'pull_request' }}