ci: update GitHub Actions workflow branch master → main

.github/workflows/rd13_media_wiki_docker_build.yml

@@ -2,9 +2,9 @@ name: Multiarch Build Docker CI for the rd13_media_wiki project
 
 on:
   push:
-    branches: [master]
+    branches: [main]
   pull_request:
-    branches: [master]
+    branches: [main]
   workflow_dispatch:
 
 jobs:
@@ -15,11 +15,11 @@ jobs:
         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: Create local main branch to use as baseline
+        if: github.ref != 'refs/heads/main'
+        run: git branch main origin/main
       - name: install buildx
-        if: github.ref == 'refs/heads/master'
+        if: github.ref == 'refs/heads/main'
         id: buildx
         uses: docker/setup-buildx-action@v1
         with:
@@ -30,7 +30,7 @@ jobs:
       #        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'
+        if: github.ref == 'refs/heads/main' || github.event.label.name == 'dependencies'
         uses: docker/login-action@v1
         with:
           registry: ghcr.io
@@ -42,7 +42,7 @@ jobs:
           docker buildx build \
             --platform linux/amd64 .
       - name: build and push the image
-        if: github.ref == 'refs/heads/master'
+        if: github.ref == 'refs/heads/main'
         run: |
           docker buildx build --push \
             --tag ghcr.io/c-schulz-rd13/rd13_media_wiki:latest \