ci: Add bin-image workflow

Build and push an image containing a static CLI binary for master branch
and every release branch and tag.

This is a slightly adjusted copy of the bin-image workflow from
docker/buildx (by @crazy-max).

Co-authored-by: CrazyMax <crazy-max@users.noreply.github.com>

Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>

.github/workflows/build.yml

@@ -4,6 +4,9 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+env:
+  VERSION: ${{ github.ref }}
+
 on:
   workflow_dispatch:
   push:
@@ -86,6 +89,50 @@ jobs:
           path: /tmp/out/*
           if-no-files-found: error
 
+  bin-image:
+    runs-on: ubuntu-20.04
+    if: ${{ github.event_name != 'pull_request' && github.repository == 'docker/cli' }}
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v4
+      -
+        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: dockereng/cli-bin
+          tags: |
+            type=semver,pattern={{version}}
+            type=ref,event=branch
+            type=ref,event=pr
+            type=sha
+      -
+        name: Login to DockerHub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_CLIBIN_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_CLIBIN_TOKEN }}
+      -
+        name: Build and push image
+        uses: docker/bake-action@v4
+        with:
+          files: |
+            ./docker-bake.hcl
+            ${{ steps.meta.outputs.bake-file }}
+          targets: bin-image-cross
+          push: ${{ github.event_name != 'pull_request' }}
+          set: |
+            *.cache-from=type=gha,scope=bin-image
+            *.cache-to=type=gha,scope=bin-image,mode=max
+
   prepare-plugins:
     runs-on: ubuntu-20.04
     outputs: