Create copy-branch.yml

.github/workflows/copy-branch.yml

@@ -0,0 +1,31 @@
+# Duplicates default main branch to the old master branch
+
+name: Duplicates main to old master branch
+
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the main branch
+on:
+  push:
+    branches: [ main ]
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "copy-branch"
+  copy-branch:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+    # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it,
+    # but specifies master branch (old default).
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+        ref: master
+
+    - run: |
+        git config user.name github-actions
+        git config user.email [email protected]
+        git merge origin/main
+        git push