Set proper file permissions once downloaded

src/installer.ts

@@ -6,6 +6,7 @@ import * as restm from 'typed-rest-client/RestClient';
 import * as os from 'os';
 import * as path from 'path';
 import * as semver from 'semver';
+import * as fs from 'fs'
 
 let osPlat: string = os.platform();
 let osArch: string = os.arch();
@@ -194,5 +195,12 @@ async function acquireKustomize(version: string): Promise<string> {
     toolPath = path.join(toolPath, toolFilename)
   }
 
+  switch (osPlat) {
+    case 'linux':
+    case 'darwin':
+      fs.chmodSync(toolPath, 0o755)
+      break;
+  }
+
   return await tc.cacheFile(toolPath, toolFilename, toolName, version);
 }