Special cache-cleanup message for read-only

sources/src/caching/cache-reporting.ts

@@ -10,6 +10,8 @@ export const DEFAULT_WRITEONLY_REASON = `[Cache was set to write-only](https://g
 
 export const EXISTING_GRADLE_HOME = `[Cache was disabled to avoid overwriting a pre-existing Gradle User Home](https://github.com/gradle/actions/blob/v3/docs/setup-gradle.md#overwriting-an-existing-gradle-user-home). Gradle User Home was not restored from or saved to the cache.`
 
+export const CLEANUP_DISABLED_READONLY = `[Cache cleanup](https://github.com/gradle/actions/blob/v3/docs/setup-gradle.md#enabling-cache-cleanup) is always disabled when cache is read-only.`
+
 export const DEFAULT_CLEANUP_DISABLED_REASON = `[Cache cleanup](https://github.com/gradle/actions/blob/v3/docs/setup-gradle.md#enabling-cache-cleanup) was not enabled. It must be explicitly enabled.`
 
 export const DEFAULT_CLEANUP_ENABLED_REASON = `[Cache cleanup](https://github.com/gradle/actions/blob/v3/docs/setup-gradle.md#enabling-cache-cleanup) was enabled.`
@@ -43,6 +45,7 @@ export class CacheListener {
     setReadOnly(reason: string = DEFAULT_READONLY_REASON): void {
         this.cacheReadOnly = true
         this.cacheStatusReason = reason
+        this.cacheCleanupMessage = CLEANUP_DISABLED_READONLY
     }
 
     setDisabled(reason: string = DEFAULT_DISABLED_REASON): void {