Create CI workflow and tests

src/index.ts

@@ -0,0 +1,28 @@
+import * as core from '@actions/core'
+import { wait } from './wait'
+
+/**
+ * The main function for the action.
+ * @returns {Promise<void>} Resolves when the action is complete.
+ */
+async function run(): Promise<void> {
+  try {
+    const ms: string = core.getInput('milliseconds')
+
+    // Debug logs are only output if the `ACTIONS_STEP_DEBUG` secret is true
+    core.debug(`Waiting ${ms} milliseconds ...`)
+
+    // Log the current timestamp, wait, then log the new timestamp
+    core.debug(new Date().toTimeString())
+    await wait(parseInt(ms, 10))
+    core.debug(new Date().toTimeString())
+
+    // Set outputs for other workflow steps to use
+    core.setOutput('time', new Date().toTimeString())
+  } catch (error) {
+    // Fail the workflow run if an error occurs
+    if (error instanceof Error) core.setFailed(error.message)
+  }
+}
+
+run()

src/wait.ts

@@ -1,3 +1,8 @@
+/**
+ * Wait for a number of milliseconds.
+ * @param milliseconds The number of milliseconds to wait.
+ * @returns {Promise<string>} Resolves with 'done!' after the wait is over.
+ */
 export async function wait(milliseconds: number): Promise<string> {
   return new Promise(resolve => {
     if (isNaN(milliseconds)) {