fix(test): add missing mock

This fixes 'Cannot spy on export "getOctokit". Module namespace is not configurable in ESM.'

cc https://vitest.dev/guide/browser/#limitations

Author: nobe4

__tests__/functions/admin.test.js

@@ -4,6 +4,8 @@ import {COLORS} from '../../src/functions/colors.js'
 import * as github from '@actions/github'
 import * as core from '@actions/core'
 
+vi.mock('@actions/github', { spy: true })
+
 const debugMock = vi.spyOn(core, 'debug')
 const warningMock = vi.spyOn(core, 'warning')
 

__tests__/functions/post.test.js

@@ -7,6 +7,8 @@ import {COLORS} from '../../src/functions/colors.js'
 import * as postDeploy from '../../src/functions/post-deploy.js'
 import * as contextCheck from '../../src/functions/context-check.js'
 
+vi.mock('@actions/github', { spy: true })
+
 const validBooleanInputs = {
   skip_completing: false
 }

__tests__/main.test.js

@@ -21,6 +21,8 @@ import * as timestamp from '../src/functions/timestamp.js'
 import * as deploymentConfirmation from '../src/functions/deployment-confirmation.js'
 import {COLORS} from '../src/functions/colors.js'
 
+vi.mock('@actions/github', { spy: true })
+
 const setOutputMock = vi.spyOn(core, 'setOutput')
 const saveStateMock = vi.spyOn(core, 'saveState')
 const setFailedMock = vi.spyOn(core, 'setFailed')