Merge pull request #5580 from unisonweb/actions-cache-service-v2

Author: aryairani

.github/workflows/ci.yaml

@@ -32,6 +32,9 @@ env:
   ## afaik, the jit sources are generated in a platform-independent way, so we choose one platform to generate them on.
   jit_generator_os: ubuntu-20.04
 
+  # work around https://github.com/actions/cache/issues/1547 which may continue causing failures until March 1, 2025
+  ACTIONS_CACHE_SERVICE_V2: true
+
 jobs:
   ormolu:
     runs-on: ubuntu-20.04