Fix path for local node12 actions (#371)

Fixes #185

Signed-off-by: Javier Romero <root@jromero.codes>

pkg/runner/testdata/actions/node12/index.js

@@ -0,0 +1,15 @@
+const core = require('@actions/core');
+const github = require('@actions/github');
+
+try {
+  // `who-to-greet` input defined in action metadata file
+  const nameToGreet = core.getInput('who-to-greet');
+  console.log(`Hello ${nameToGreet}!`);
+  const time = (new Date()).toTimeString();
+  core.setOutput("time", time);
+  // Get the JSON webhook payload for the event that triggered the workflow
+  const payload = JSON.stringify(github.context.payload, undefined, 2)
+  console.log(`The event payload: ${payload}`);
+} catch (error) {
+  core.setFailed(error.message);
+}