fixup! use julia-actions/cache

Author: vchuravy

.github/workflows/CI.yml

@@ -5,6 +5,12 @@ on:
     branches:
       - main
     tags: "*"
+
+# needed to allow julia-actions/cache to delete old caches that it has created
+permissions:
+  actions: write
+  contents: read
+
 jobs:
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}