From b888213130bd67952aac7f44b708a33650c7b59b Mon Sep 17 00:00:00 2001
From: Sylvain <35365065+sanderegg@users.noreply.github.com>
Date: Thu, 8 Aug 2024 12:31:14 +0200
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8Maintenance:=20adds=20CI=20workflow=20?=
 =?UTF-8?q?to=20cleanup=20caches=20when=20a=20branch=20is=20merged=20(#615?=
 =?UTF-8?q?4)?=
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---
 .../workflows/cleanup-caches-by-branches.yml  | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 .github/workflows/cleanup-caches-by-branches.yml

diff --git a/.github/workflows/cleanup-caches-by-branches.yml b/.github/workflows/cleanup-caches-by-branches.yml
new file mode 100644
index 00000000000..bd3f5e3290b
--- /dev/null
+++ b/.github/workflows/cleanup-caches-by-branches.yml
@@ -0,0 +1,30 @@
+# originates from https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/caching-dependencies-to-speed-up-workflows#managing-caches
+name: cleanup caches by a branch
+on:
+  pull_request:
+    types:
+      - closed
+
+jobs:
+  cleanup:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Cleanup
+        run: |
+          gh extension install actions/gh-actions-cache
+
+          echo "Fetching list of cache key"
+          cacheKeysForPR=$(gh actions-cache list -R $REPO -B $BRANCH -L 100 | cut -f 1 )
+
+          ## Setting this to not fail the workflow while deleting cache keys.
+          set +e
+          echo "Deleting caches..."
+          for cacheKey in $cacheKeysForPR
+          do
+              gh actions-cache delete $cacheKey -R $REPO -B $BRANCH --confirm
+          done
+          echo "Done"
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          REPO: ${{ github.repository }}
+          BRANCH: refs/pull/${{ github.event.pull_request.number }}/merge