From 0755abe308f149e46753f5021538aaeb2f2c6caf Mon Sep 17 00:00:00 2001
From: Tadej Novak <tadej@tano.si>
Date: Wed, 19 Apr 2023 20:52:27 +0200
Subject: [PATCH] [ci] Cleanup caches when PR is closed (#29)

---
 .github/workflows/CI-cache-cleanup.yml | 39 ++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 .github/workflows/CI-cache-cleanup.yml

diff --git a/.github/workflows/CI-cache-cleanup.yml b/.github/workflows/CI-cache-cleanup.yml
new file mode 100644
index 0000000..15cac45
--- /dev/null
+++ b/.github/workflows/CI-cache-cleanup.yml
@@ -0,0 +1,39 @@
+name: cleanup-branch-caches
+on:
+  pull_request:
+    types:
+      - closed
+  workflow_dispatch:
+
+jobs:
+  cleanup:
+    runs-on: ubuntu-latest
+    permissions:
+      # `actions:write` permission is required to delete caches
+      #   See also: https://docs.github.com/en/rest/actions/cache?apiVersion=2022-11-28#delete-a-github-actions-cache-for-a-repository-using-a-cache-id
+      actions: write
+      contents: read
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v3
+
+      - name: Cleanup
+        run: |
+          gh extension install actions/gh-actions-cache
+          
+          REPO=${{ github.repository }}
+          BRANCH=refs/pull/${{ github.event.pull_request.number }}/merge
+
+          echo "Fetching list of cache key"
+          cacheKeysForPR=$(gh actions-cache list -R $REPO -B $BRANCH | 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 }}