Add build workflow

.github/workflows/image.yml

@@ -0,0 +1,35 @@
+name: Build docker WordPress image
+
+on:
+  push:
+    branches: master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout code
+        uses: actions/checkout@v2
+      - name: Cache Docker layers
+        uses: actions/cache@v2
+        id: cache
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-        
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          config-inline: |
+            [worker.oci]
+              max-parallelism = 16
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Build image
+        run: build/bin/build

build/bin/build

@@ -0,0 +1,3 @@
+#!/usr/bin/env sh
+
+docker buildx bake --push --file build/docker-bake.hcl

build/docker-bake.hcl

@@ -0,0 +1,23 @@
+group "default" {
+  targets = ["1_0"]
+}
+
+target "build-dockerfile" {
+  dockerfile = "Dockerfile"
+}
+
+target "build-platforms" {
+  platforms = ["linux/amd64"]
+}
+
+target "build-common" {
+  pull = true
+}
+
+target "1_0" {
+  inherits = ["build-dockerfile", "build-platforms", "build-common"]
+  tags     = ["docker.io/nlss/bbk-cli:1", "docker.io/nlss/bbk-cli:1.0", "docker.io/nlss/bbk-cli:latest"]
+  args = {
+    BBKCLI_VERSION = "1.0"
+  }
+}