1 files changed, 40 insertions, 0 deletions
diff --git a/.github/workflows/cleanup_caches.yml b/.github/workflows/cleanup_caches.yml
new file mode 100644
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+++ b/.github/workflows/cleanup_caches.yml
@@ -0,0 +1,40 @@
+name: Cleanup caches
+
+on:
+  workflow_run:
+    workflows: [build]
+    types: [completed]
+
+jobs:
+  cache:
+    runs-on: ubuntu-latest
+    steps:
+      - run: |
+          gh cache list -L 100 --json id,key,ref -S last_accessed_at -O desc --jq '
+            map(select(.key | startswith("x86_64-w64-mingw32-") or
+                              startswith("i686-w64-mingw32-") or
+                              startswith("x86_64-windows-msvc-"))) |
+            group_by(.ref) |
+            map({
+              ref: .[0].ref,
+              caches: map({
+                        key: .key,
+                        prefix: (.key | capture("^(?<prefix>[\\w_-]+-)\\d+$").prefix)
+                      }) | group_by(.prefix) | map({keys: map(.key)})
+            }) |
+            .[]
+          ' |
+          while read -r group; do
+            pr=$(echo "$group" | jq -r '.ref | capture("refs/pull/(?<num>[0-9]+)/merge").num')
+            if [[ -n "$pr" ]] && [ "$(gh pr view $pr --json state --jq '.state')" != "OPEN" ]; then
+              keys=$(echo "$group" | jq -c '.caches | map(.keys) | .[]')
+            else
+              keys=$(echo "$group" | jq -c '.caches | map(.keys[1:]) | .[]')
+            fi
+            for key in $(echo "$keys" | jq -r '.[]'); do
+              gh cache delete "$key"
+            done
+          done
+    env:
+      GH_REPO: ${{ github.repository }}
+      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}