feat: add GH Actions workflow

.github/workflows/main.yml

@@ -0,0 +1,46 @@
+name: Build, test and publish images
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    types: [opened, synchronize]
+
+jobs:
+
+  build-test-push:
+    name: Build, test and publish
+    runs-on: ubuntu-20.04
+    if: "!contains(github.event.commits[0].message, 'skip ci')"
+    strategy:
+      matrix:
+        version: [ '5.4', '5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4' ]
+        flavor: [ '', '-apache', '-fpm' ]
+        include:
+          - version: 'latest'
+            flavor: ''
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Build images
+        run: |
+          make build VERSION=${VERSION}
+          make -C dev build VERSION=${VERSION}
+        env:
+          VERSION: "${{ matrix.version }}${{ matrix.flavor }}"
+
+      - name: Test images
+        run: |
+          make test VERSION=${VERSION}
+          make -C dev test VERSION=${VERSION}
+        env:
+          VERSION: "${{ matrix.version }}${{ matrix.flavor }}"
+
+      - name: Publish images
+        if: "github.event_name != 'pull_request'"
+        run: |
+          make push VERSION=${VERSION}
+          make -C dev push VERSION=${VERSION}
+        env:
+          VERSION: "${{ matrix.version }}${{ matrix.flavor }}"