feat: add post step when action run was cancelled

In post step, we will send cancel request to TF to cancel pending Test run.

action.yml

@@ -93,3 +93,5 @@ outputs:
 runs:
   using: node20
   main: dist/index.js
+  post-if: cancelled()
+  post: dist/index.js

src/main.ts

@@ -1,23 +1,28 @@
-import { getBooleanInput, getInput, setFailed } from '@actions/core';
+import { getBooleanInput, getInput, getState, setFailed } from '@actions/core';
 import { context } from '@actions/github';
 
 import '@total-typescript/ts-reset';
 
 import action from './action';
 import { TFError } from './error';
 import { getOctokit } from './octokit';
+import post from './post';
 import { PullRequest } from './pull-request';
 
 let pr: PullRequest | undefined = undefined;
 
+// All the code should be inside this try block
 try {
   const octokit = getOctokit(getInput('github_token', { required: true }));
 
   pr = await PullRequest.initialize(context.issue.number, octokit);
 
-  // Call the action function from action.ts
-  // all the code should be inside this try block
-  await action(pr);
+  if (!getState('isPost')) {
+    // Call the action function from action.ts
+    await action(pr);
+  } else {
+    await post();
+  }
 } catch (error) {
   let message: string;
 

src/post.ts

@@ -0,0 +1,21 @@
+import { getInput } from '@actions/core';
+import TestingFarmAPI from 'testing-farm';
+
+async function post(): Promise<void> {
+  const tfInstance = getInput('api_url');
+  const tfRequestId = process.env['OUTPUT_REQUEST_ID'];
+
+  const api = new TestingFarmAPI(tfInstance);
+
+  if (!tfRequestId) {
+    throw new Error('POST: Missing Testing Farm request id');
+  }
+
+  const request = {
+    api_key: getInput('api_key', { required: true }),
+  };
+
+  await api.cancelRequest(tfRequestId, request, false);
+}
+
+export default post;