Merge 42e6e83ca6 into 638ed79f9d

Add note on runner versions

README.md

@@ -19,16 +19,19 @@ See ["Caching dependencies to speed up workflows"](https://docs.github.com/en/ac
 
 The cache backend service has been rewritten from the ground up for improved performance and reliability. [actions/cache](https://github.com/actions/cache) now integrates with the new cache service (v2) APIs.
 
-The new service will gradually roll out as of **February 1st, 2025**. The legacy service will also be sunset on the same date. Changes in these release are **fully backward compatible**.
+The new service will gradually roll out as of **February 1st, 2025**. The legacy service will also be sunset on the same date. Changes in these releases are **fully backward compatible**.
 
 **We are deprecating some versions of this action**. We recommend upgrading to version `v4` or `v3` as soon as possible before **February 1st, 2025.** (Upgrade instructions below).
 
-If you are using pinned SHAs, please use the SHAs of versions `v4.2.0` or `v3.4.0`
+If you are using pinned SHAs, please use the SHAs of versions `v4.2.0` or `v3.4.0`.
 
 If you do not upgrade, all workflow runs using any of the deprecated [actions/cache](https://github.com/actions/cache) will fail.
 
 Upgrading to the recommended versions will not break your workflows.
 
+> **Additionally, if you are managing your own GitHub runners, you must update your runner version to `2.231.0` or newer to ensure compatibility with the new cache service.**  
+> Failure to update both the action version and your runner version may result in workflow failures after the migration date.
+
 Read more about the change & access the migration guide: [reference to the announcement](https://github.com/actions/cache/discussions/1510).
 
 ### v4

examples.md

@@ -41,6 +41,9 @@
 - [Swift - Swift Package Manager](#swift---swift-package-manager)
 - [Swift - Mint](#swift---mint)
 - [* - Bazel](#---bazel)
+- [Common use cases](#common-use-cases)
+  - [Restore-only caches](#restore-only-caches)
+  - [Automatically detect cached paths](#automatically-detect-cached-paths)
 
 ## Bun
 
@@ -712,3 +715,32 @@ steps:
       ${{ runner.os }}-bazel-
 - run: bazelisk test //...
 ```
+##  Common use cases
+
+### Restore-only caches
+If there are several builds on the same repo it might make sense to create a cache in one build and use it in the
+others. The action [actions/cache/restore](https://github.com/actions/cache/blob/main/restore/README.md#only-restore-cache)
+should be used in this case.
+
+### Automatically detect cached paths
+[Defining outputs for jobs](https://docs.github.com/en/actions/using-jobs/defining-outputs-for-jobs) can be used to
+automatically detect paths to cache and use them to configure `actions/cache` action.
+
+```yaml
+- name: Get Go cached paths
+  id: find-cached-paths
+  run: |
+    echo "cache=$(go env GOCACHE)" >> $GITHUB_ENV
+    echo "modcache=$(go env GOMODCACHE)" >> $GITHUB_ENV
+
+- name: Set up cache
+  uses: actions/cache@v3
+  needs: find-cached-paths
+  with:
+    path: |
+      ${{ env.cache }}
+      ${{ env.modcache }}
+    key: setup-go-${{ runner.os }}-go-${{ hashFiles('go.sum go.mod') }}
+    restore-keys: |
+      setup-go-${{ runner.os }}-go-
+```