ci: export docker image in build_slim_packages

.github/workflows/build_slim_packages.yaml

@@ -10,7 +10,7 @@ on:
   workflow_dispatch:
 
 jobs:
-  build:
+  linux:
     runs-on: ${{ matrix.runs-on }}
 
     strategy:
@@ -152,3 +152,91 @@ jobs:
       with:
         name: ${{ matrix.os }}
         path: _packages/**/*.zip
+
+  docker:
+    runs-on: ${{ matrix.runs-on }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        otp:
+          - 24.3.4.2-1
+        runs-on:
+          - aws-amd64
+          - ubuntu-22.04
+        use-self-hosted:
+          - ${{ github.repository_owner == 'emqx' }}
+        exclude:
+          - runs-on: ubuntu-22.04
+            use-self-hosted: true
+          - runs-on: aws-amd64
+            use-self-hosted: false
+
+    steps:
+    - uses: AutoModality/action-clean@v1
+    - uses: actions/checkout@v3
+      with:
+          fetch-depth: 0 # clone full git history
+    - name: fix-git-unsafe-repository
+      run: git config --global --add safe.directory /__w/emqx/emqx
+    - name: prepare
+      run: |
+        if [ -f 'EMQX_ENTERPRISE' ]; then
+          EMQX_NAME=emqx-ee
+        else
+          EMQX_NAME=emqx
+        fi
+        EMQX_IMAGE_TAG=localhost:5000/${{ github.repository_owner }}/$EMQX_NAME
+        PKG_VSN=${PKG_VSN:-$(./pkg-vsn.sh $EMQX_NAME)}
+        echo "EMQX_NAME=$EMQX_NAME" >> $GITHUB_ENV
+        echo "PKG_VSN=$PKG_VSN" >> $GITHUB_ENV
+        echo "EMQX_IMAGE_TAG=$EMQX_IMAGE_TAG" >> $GITHUB_ENV
+    - name: ensure access to github
+      if: endsWith(github.repository, 'enterprise')
+      run: |
+        echo "https://ci%40emqx.io:${{ secrets.CI_GIT_TOKEN }}@github.com" > $HOME/.git-credentials
+        git config --global credential.helper store
+    - uses: docker/setup-buildx-action@v2
+    - uses: docker/metadata-action@v4
+      id: meta
+      with:
+        images: ${{ env.EMQX_IMAGE_TAG }}
+        flavor: |
+          latest=false
+        tags: |
+          type=ref,event=branch
+          type=ref,event=pr
+          type=match,pattern=[v|e](.*),group=1
+        labels:
+          org.opencontainers.image.otp.version=${{ matrix.otp }}
+    - uses: docker/build-push-action@v4
+      if: endsWith(github.repository, 'emqx')
+      with:
+        load: true
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}
+        build-args: |
+          BUILD_FROM=ghcr.io/emqx/emqx-builder/4.4-24:${{ matrix.otp }}-alpine3.15.1
+          RUN_FROM=alpine:3.15.1
+          EMQX_NAME=${{ env.EMQX_NAME }}
+        file: deploy/docker/Dockerfile
+        context: .
+    - uses: docker/build-push-action@v4
+      if: endsWith(github.repository, 'enterprise')
+      with:
+        load: true
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}
+        build-args: |
+          BUILD_FROM=ghcr.io/emqx/emqx-builder/4.4-24:${{ matrix.otp }}-alpine3.15.1
+          RUN_FROM=alpine:3.15.1
+          EMQX_NAME=${{ env.EMQX_NAME }}
+        file: deploy/docker/Dockerfile.enterprise
+        context: .
+    - name: export docker image
+      run: |
+        docker save ${{ steps.meta.outputs.tags }} | gzip > $EMQX_NAME-$PKG_VSN.tar.gz
+    - uses: actions/upload-artifact@v3
+      with:
+        name: "${{ env.EMQX_NAME }}-docker"
+        path: "${{ env.EMQX_NAME }}-${{ env.PKG_VSN }}.tar.gz"