Warn and make Gradle Wrapper script executable

Instead of failing the build, detect a non-executable wrapper file
and set the executable bit.

Fixes #17

dist/setup-gradle/main/index.js

@@ -140722,6 +140722,7 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
 };
 Object.defineProperty(exports, "__esModule", ({ value: true }));
 exports.gradleWrapperScript = exports.installScriptFilename = exports.wrapperScriptFilename = void 0;
+const core = __importStar(__nccwpck_require__(42186));
 const path = __importStar(__nccwpck_require__(71017));
 const fs_1 = __importDefault(__nccwpck_require__(57147));
 const IS_WINDOWS = process.platform === 'win32';
@@ -140755,7 +140756,8 @@ function verifyIsExecutableScript(toExecute) {
         fs_1.default.accessSync(toExecute, fs_1.default.constants.X_OK);
     }
     catch (err) {
-        throw new Error(`Gradle script '${toExecute}' is not executable.`);
+        core.warning(`Gradle wrapper script '${toExecute}' is not executable. Action will set executable permission and continue.`);
+        fs_1.default.chmodSync(toExecute, '755');
     }
 }