Fix versioning for push event.

src/model/system.js

@@ -1,9 +1,11 @@
+import * as core from '@actions/core';
 import { exec } from '@actions/exec';
 
 class System {
   static async run(command, arguments_, options) {
     let result = '';
     let error = '';
+    let debug = '';
 
     const listeners = {
       stdout: dataBuffer => {
@@ -12,13 +14,29 @@ class System {
       stderr: dataBuffer => {
         error += dataBuffer.toString();
       },
+      debug: dataString => {
+        debug += dataString.toString();
+      },
     };
 
     const exitCode = await exec(command, arguments_, { ...options, listeners });
+
+    if (debug !== '') {
+      core.debug(debug);
+    }
+
+    if (result !== '') {
+      core.info(result);
+    }
+
     if (exitCode !== 0) {
       throw new Error(error);
     }
 
+    if (error !== '') {
+      core.warning(error);
+    }
+
     return result;
   }
 }