Initial pass on script Action

main.js

@@ -0,0 +1,20 @@
+const core = require('@actions/core')
+const {GitHub, context} = require('@actions/github')
+
+process.on('unhandledRejection', handleError)
+main().catch(handleError)
+
+async function main() {
+  const AsyncFunction = Object.getPrototypeOf(async () => {}).constructor
+  const script = core.getInput('script', {required: true})
+  const token = core.getInput('github-token', {required: true})
+  const fn = new AsyncFunction('github', 'context', script)
+  const client = new GitHub(token)
+  const result = await fn(client, context)
+  core.setOutput('result', JSON.stringify(result))
+}
+
+function handleError(err) {
+  console.error(err)
+  core.setFailed(err.message)
+}