Add container registry

.github/workflows/registry.yml

@@ -0,0 +1,20 @@
+name: Publish Docker
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        version: ["7.4", "7.3", "7.2", "7.1", "7.0", "5.6", "5.5"]
+    steps:
+      - uses: actions/checkout@master
+      - name: Build PHP ${{ matrix.version }} and publish to GitHub Registry
+        uses: elgohr/Publish-Docker-Github-Action@2.22
+        with:
+          name: mileschou/composer-action/runner:${{ matrix.version }}
+          username: ${{ secrets.GITHUB_USERNAME }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+          registry: docker.pkg.github.com
+          dockerfile: ${{ matrix.version }}/Dockerfile