fix: action failure status (#151)

Close #149

* chore: fix path to .gitconfig

src/index.ts

@@ -1,3 +1,8 @@
+import * as core from '@actions/core';
 import * as main from './main';
 
-main.run();
+try {
+  main.run();
+} catch (e) {
+  core.setFailed(`Action failed with error ${e}`);
+}