Revert "remove dependencies for cache"

This reverts commit dcd8b60085.

.github/workflows/cache-merge.yml

@@ -7,6 +7,8 @@ on:
       - "**"
     branches:
       - main
+  pull_request:
+    branches: ["main"]
   merge_group:
   schedule:
     - cron: 0 0 * * *
@@ -18,6 +20,7 @@ jobs:
   # Save new `common` caches
   merge-similar-caches:
     name: Merge similar caches
+    needs: make-similar-caches
     strategy:
       matrix:
         os: