Build and push lite image to dockerhub from GitHub actions (#68)

.github/workflows/docker_build_lite.yml

@@ -0,0 +1,60 @@
+name: Docker Build Lite
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - '*'
+
+concurrency:
+  group: format('{0}-{1}', ${{ github.ref }}, 'Docker Build Lite')
+  cancel-in-progress: true
+
+permissions: read-all
+
+jobs:
+  build_and_push:
+    name: Build and push vitess/lite Docker images
+    runs-on: ubuntu-latest # TODO: replace by larger runners
+    if: github.repository == 'vitessio/vitess'
+
+    strategy:
+      fail-fast: true
+      matrix:
+        branch: [ latest, mysql57, mysql80, percona57, percona80 ]
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push on main
+        if: github.ref == 'refs/heads/main'
+        uses: docker/build-push-action@v5
+        with:
+          file: ${{ (matrix.branch == 'latest') && './docker/lite/Dockerfile' || './docker/lite/Dockerfile.' + matrix.branch }}
+          push: true
+          tags: vitess/lite:${{ matrix.branch }}
+
+      - name: Get the tag name
+        if: startsWith(github.ref, 'refs/tags/')
+        run: echo "TAG_NAME=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
+
+      - name: Build and push on main
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: docker/build-push-action@v5
+        with:
+          file: ${{ (matrix.branch == 'latest') && './docker/lite/Dockerfile' || './docker/lite/Dockerfile.' + matrix.branch }}
+          push: true
+          tags: ${{ (matrix.branch == 'latest') && 'vitess/lite:' + env.TAG_NAME || 'vitess/lite:' + env.TAG_NAME + '-' + matrix.branch }}