feat(gmail): add gmail integration

packages/backend/src/apps/gmail/index.js

@@ -0,0 +1,15 @@
+import defineApp from '../../helpers/define-app.js';
+import addAuthHeader from './common/add-auth-header.js';
+import auth from './auth/index.js';
+export default defineApp({
+  name: 'Gmail',
+  key: 'gmail',
+  baseUrl: 'https://mail.google.com',
+  apiBaseUrl: 'https://gmail.googleapis.com',
+  iconUrl: '{BASE_URL}/apps/gmail/assets/favicon.svg',
+  authDocUrl: 'https://automatisch.io/docs/apps/gmail/connection',
+  primaryColor: 'ea4335',
+  supportsConnections: true,
+  beforeRequest: [addAuthHeader],
+  auth,
+});