Added tag output

lib/main.js

@@ -14,7 +14,7 @@ async function run() {
     core.debug(`Working Directory: ${process.env.GITHUB_WORKSPACE}:\n${dir}`)
     core.warning(`Available environment variables:\n -> ${Object.keys(process.env).join('\n -> ')}`)
 
-    core.setOutput('')
+    core.setOutput('tag', '')
   } catch (error) {
     core.setFailed(error.message)
   }