Refactor github mock to use Context class

Co-Authored-By: Claude <noreply@anthropic.com>

__mocks__/@actions/github.js

@@ -1,49 +0,0 @@
-'use strict';
-
-// CJS shim for @actions/github (v9+ is ESM-only, incompatible with Jest's CJS resolver).
-// Replicates the Context class behaviour used by this repo: reads GITHUB_* env vars.
-const context = {
-  get repo() {
-    const [owner, repo] = (process.env['GITHUB_REPOSITORY'] || '/').split('/');
-    return {owner, repo};
-  },
-  get eventName() {
-    return process.env['GITHUB_EVENT_NAME'] || '';
-  },
-  get sha() {
-    return process.env['GITHUB_SHA'] || '';
-  },
-  get ref() {
-    return process.env['GITHUB_REF'] || '';
-  },
-  get workflow() {
-    return process.env['GITHUB_WORKFLOW'] || '';
-  },
-  get action() {
-    return process.env['GITHUB_ACTION'] || '';
-  },
-  get actor() {
-    return process.env['GITHUB_ACTOR'] || '';
-  },
-  get job() {
-    return process.env['GITHUB_JOB'] || '';
-  },
-  get runNumber() {
-    return parseInt(process.env['GITHUB_RUN_NUMBER'] || '0', 10);
-  },
-  get runId() {
-    return parseInt(process.env['GITHUB_RUN_ID'] || '0', 10);
-  },
-  get apiUrl() {
-    return process.env['GITHUB_API_URL'] || 'https://api.github.com';
-  },
-  get serverUrl() {
-    return process.env['GITHUB_SERVER_URL'] || 'https://github.com';
-  },
-  get graphqlUrl() {
-    return process.env['GITHUB_GRAPHQL_URL'] || 'https://api.github.com/graphql';
-  },
-  payload: {}
-};
-
-module.exports = {context};

__tests__/mock/github-mock.ts

@@ -0,0 +1,3 @@
+import {Context} from '@actions/github/lib/context';
+
+export const context = new Context();

jest.config.js

@@ -9,6 +9,6 @@ module.exports = {
   },
   verbose: true,
   moduleNameMapper: {
-    '^@actions/github$': '<rootDir>/__mocks__/@actions/github.js'
+    '^@actions/github$': '<rootDir>/__tests__/mock/github-mock.ts'
   }
 }