fix: make downloaded bin executable (#8)

* docs

* make downloaded bin executable

src/main.ts

@@ -1,4 +1,5 @@
 import * as core from '@actions/core'
+import {chmodSync} from 'fs'
 import {getConfig} from './config'
 import {getTool} from './tool'
 
@@ -7,6 +8,7 @@ async function run(): Promise<void> {
     const config = getConfig()
     const tool = await getTool(config)
     core.addPath(tool)
+    chmodSync(tool, '755')
   } catch (error) {
     core.setFailed(error.message)
   }