feat: add CI to detect references

.github/workflows/check-reference.yml

@@ -0,0 +1,34 @@
+name: Check patch references
+
+on:
+ push:
+ branches-ignore:
+ - dependabot/**
+ schedule:
+ # Once every day at midnight UTC
+ - cron: "0 0 * * *"
+
+jobs:
+ stale:
+ runs-on: ubuntu-latest
+ steps:
+ - name: Checkout patches
+ uses: actions/checkout@v4
+
+ - name: Checkout core
+ uses: actions/checkout@v4
+ with:
+ repository: 'homebrew/homebrew-core'
+ path: homebrew-core
+
+ - name: Detect references
+ run: |
+ patches=$(find -name "*.patch" -printf "%f\n")
+ status=0
+ for patch in $patches; do
+ if ! git -C "homebrew-core" grep -r "${patch/./}" > /dev/null; then
+ echo "$patch not needed!"
+ status=1
+ fi
+ done
+ exit $status