Remove support for wrapper-directory

In the (rare) case where using a non-default Gradle wrapper is required,
the `gradle-executable` paramater can be used.

README.md

@@ -60,14 +60,6 @@ If you need to pass environment variables, simply use the GitHub Actions workflo
     build-root-directory: some/subdirectory
 ```
 
-## Use a Gradle wrapper from a different directory
- 
-```yaml
- - uses: eskatos/gradle-command-action@v1
-   with:
-     wrapper-directory: path/to/wrapper-directory
- ```
-
 ## Use a specific `gradle` executable
 
 ```yaml
@@ -76,7 +68,15 @@ If you need to pass environment variables, simply use the GitHub Actions workflo
      gradle-executable: path/to/gradle
 ```
 
-## Setup and use a declared Gradle version
+## Use a Gradle wrapper from a different directory
+ 
+```yaml
+ - uses: eskatos/gradle-command-action@v1
+   with:
+     gradle-executable: path/to/gradlew
+ ```
+
+## Download and use a specified Gradle version
 
 ```yaml
  - uses: eskatos/gradle-command-action@v1

action.yml

@@ -5,9 +5,6 @@ author: 'Paul Merlin <paul@nospere.org>'
 # https://help.github.com/en/articles/metadata-syntax-for-github-actions
 
 inputs:
-  wrapper-directory:
-    description: Path to the Gradle Wrapper directory
-    required: false
   gradle-executable:
     description: Path to the Gradle executable
     required: false

src/main.ts

@@ -41,11 +41,13 @@ async function resolveGradleExecutable(
     workspaceDirectory: string,
     buildRootDirectory: string
 ): Promise<string> {
+    // Download and use a specified Gradle version
     const gradleVersion = github.inputOrNull('gradle-version')
     if (gradleVersion !== null && gradleVersion !== 'wrapper') {
         return path.resolve(await provision.gradleVersion(gradleVersion))
     }
 
+    // Use a Gradle executable if defined
     const gradleExecutable = github.inputOrNull('gradle-executable')
     if (gradleExecutable !== null) {
         if (gradleExecutable.endsWith(gradlew.wrapperFilename())) {
@@ -56,16 +58,10 @@ async function resolveGradleExecutable(
         return path.resolve(workspaceDirectory, gradleExecutable)
     }
 
-    const wrapperDirectory = github.inputOrNull('wrapper-directory')
-    const gradlewDirectory =
-        wrapperDirectory !== null
-            ? path.resolve(workspaceDirectory, wrapperDirectory)
-            : buildRootDirectory
-
-    gradlew.validateGradleWrapper(gradlewDirectory)
-    await cacheWrapper.restoreCachedWrapperDist(gradlewDirectory)
-
-    return path.resolve(gradlewDirectory, gradlew.wrapperFilename())
+    // By default, use the Gradle wrapper declared for the build
+    gradlew.validateGradleWrapper(buildRootDirectory)
+    await cacheWrapper.restoreCachedWrapperDist(buildRootDirectory)
+    return path.resolve(buildRootDirectory, gradlew.wrapperFilename())
 }
 
 function resolveBuildRootDirectory(baseDirectory: string): string {