Prefer ‘release-candidate’ instead of ‘rc’

This makes the version alias match other places where we reference a release candidate version.
The 'rc' alias is still supported, but emits a deprecation warning.

.github/workflows/prod.yml

@@ -31,7 +31,7 @@ jobs:
     - name: Test use Gradle version alias
       uses: ./
       with:
-        gradle-version: rc
+        gradle-version: release-candidate
         build-root-directory: __tests__/samples/no-wrapper
         arguments: help
     - name: Test use defined Gradle executable

README.md

@@ -94,7 +94,7 @@ Moreover, you can use the following aliases:
 | --- |---|
 | `wrapper`           | The Gradle wrapper's version (default, useful for matrix builds) |
 | `current`           | The current [stable release](https://gradle.org/install/) |
-| `rc`      | The current [release candidate](https://gradle.org/release-candidate/) if any, otherwise fallback to `current` |
+| `release-candidate` | The current [release candidate](https://gradle.org/release-candidate/) if any, otherwise fallback to `current` |
 | `nightly`           | The latest [nightly](https://gradle.org/nightly/), fails if none. |
 | `release-nightly`   | The latest [release nightly](https://gradle.org/release-nightly/), fails if none.      |
 
@@ -116,7 +116,7 @@ jobs:
         java-version: 11
     - uses: eskatos/gradle-command-action@v1
       with:
-        gradle-version: rc
+        gradle-version: release-candidate
         arguments: build --dry-run # just test build configuration
 ```
 

src/provision.ts

@@ -19,6 +19,11 @@ export async function gradleVersion(version: string): Promise<string> {
         case 'current':
             return gradleCurrent()
         case 'rc':
+            core.warning(
+                `Specifying gradle-version 'rc' has been deprecated. Use 'release-candidate' instead.`
+            )
+            return gradleReleaseCandidate()
+        case 'release-candidate':
             return gradleReleaseCandidate()
         case 'nightly':
             return gradleNightly()