Create mirror.yml

Author: angerman

.github/workflows/mirror.yml

@@ -0,0 +1,25 @@
+name: Mirror Repository
+
+on:
+  schedule:
+    # Runs at the start of every hour
+    - cron: '0 * * * *'
+  workflow_dispatch:
+
+jobs:
+  mirror:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout target repository
+      uses: actions/checkout@v2
+      with:
+        ref: 'repo'
+
+    - name: Sync with source repository
+      run: |
+        git remote add source https://github.com/IntersectMBO/cardano-haskell-packages.git
+        git fetch source
+        git reset --hard source/repo
+        git push origin repo
+