prepare for gh cr builds

.github/workflows/rd13_media_wiki_docker_build.yml

@@ -0,0 +1,51 @@
+name: Multiarch Build Docker CI for the rd13_media_wiki project
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0 # fetch depth 0 is required for nx commands to properly compare code against main branch
+      - name: Create local master branch to use as baseline
+        if: github.ref != 'refs/heads/master'
+        run: git branch master origin/master
+      - name: install buildx
+        if: github.ref == 'refs/heads/master'
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          version: latest
+      # If Multiarch build this will be required for ARM builds
+      #      - name: Set up QEMU
+      #        uses: docker/setup-qemu-action@v1
+      #        with:
+      #          platforms: linux/amd64,linux/arm/v7,linux/arm64
+      - name: Login to GitHub Container Registry
+        if: github.ref == 'refs/heads/master' || github.event.label.name == 'dependencies'
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.RD13_MW_DOCKER_BUILD_TOKEN }}
+      - name: build the image
+        if: github.event.label.name == 'dependencies'
+        run: |
+          docker buildx build \
+            --platform linux/amd64 .
+      - name: build and pushthe image
+        if: github.ref == 'refs/heads/master'
+        run: |
+          docker buildx build --push \
+            --tag ghcr.io/c-schulz-rd13/rd13_media_wiki:latest \
+            --platform linux/amd64 .
+# This line can be used for multiARCH builds
+#            --platform linux/amd64,linux/arm/v7,linux/arm64 .

docker-compose.yml

@@ -5,6 +5,7 @@ version: '3'
 services:
 
   mediawiki:
+    #image: ghcr.io/c-schulz-rd13/rd13_media_wiki:latest
     build: .
     ports:
       - '8090:80'