feat: update environment variables to use javascript-based config

.gitignore

@@ -1,5 +1,6 @@
 .DS_Store
 .eslintcache
+env.config.js
 node_modules
 npm-debug.log
 coverage

example.env.config.js

@@ -0,0 +1,75 @@
+/*
+Learner Dashboard is now able to handle JS-based configuration!
+
+For the time being, the `.env.*` files are still made available when cloning down this repo or pulling from
+the master branch. To switch to using `env.config.js`, make a copy of `example.env.config.js` and configure as needed.
+
+For testing with Jest Snapshot, there is a mock in `/src/setupTest.jsx` for `getConfig` that will need to be
+uncommented.
+
+Note: having both .env and env.config.js files will follow a predictable order, in which non-empty values in the
+JS-based config will overwrite the .env environment variables.
+
+frontend-platform's getConfig loads configuration in the following sequence:
+- .env file config
+- optional handlers (commonly used to merge MFE-specific config in via additional process.env variables)
+- env.config.js file config
+- runtime config
+*/
+
+module.exports = {
+  NODE_ENV: 'development',
+  NODE_PATH: './src',
+  PORT: 1996,
+  BASE_URL: 'localhost:1996',
+  LMS_BASE_URL: 'http://localhost:18000',
+  ECOMMERCE_BASE_URL: 'http://localhost:18130',
+  LOGIN_URL: 'http://localhost:18000/login',
+  LOGOUT_URL: 'http://localhost:18000/logout',
+  LOGO_URL: 'https://edx-cdn.org/v3/default/logo.svg',
+  LOGO_TRADEMARK_URL: 'https://edx-cdn.org/v3/default/logo-trademark.svg',
+  LOGO_WHITE_URL: 'https://edx-cdn.org/v3/default/logo-white.svg',
+  LOGO_POWERED_BY_OPEN_EDX_URL_SVG: 'https://edx-cdn.org/v3/stage/open-edx-tag.svg',
+  FAVICON_URL: 'https://edx-cdn.org/v3/default/favicon.ico',
+  CSRF_TOKEN_API_PATH: '/csrf/api/v1/token',
+  REFRESH_ACCESS_TOKEN_ENDPOINT: 'http://localhost:18000/login_refresh',
+  ACCESS_TOKEN_COOKIE_NAME: 'edx-jwt-cookie-header-payload',
+  USER_INFO_COOKIE_NAME: 'edx-user-info',
+  SITE_NAME: 'localhost',
+  DATA_API_BASE_URL: 'http://localhost:8000',
+  // LMS_CLIENT_ID should match the lms DOT client application in your LMS container
+  LMS_CLIENT_ID: 'login-service-client-id',
+  SEGMENT_KEY: '',
+  FEATURE_FLAGS: {},
+  MARKETING_SITE_BASE_URL: 'http://localhost:18000',
+  SUPPORT_URL: 'http://localhost:18000/support',
+  CONTACT_URL: 'http://localhost:18000/contact',
+  OPEN_SOURCE_URL: 'http://localhost:18000/openedx',
+  TERMS_OF_SERVICE_URL: 'http://localhost:18000/terms-of-service',
+  PRIVACY_POLICY_URL: 'http://localhost:18000/privacy-policy',
+  FACEBOOK_URL: 'https://www.facebook.com',
+  TWITTER_URL: 'https://twitter.com',
+  YOU_TUBE_URL: 'https://www.youtube.com',
+  LINKED_IN_URL: 'https://www.linkedin.com',
+  REDDIT_URL: 'https://www.reddit.com',
+  APPLE_APP_STORE_URL: 'https://www.apple.com/ios/app-store/',
+  GOOGLE_PLAY_URL: 'https://play.google.com/store',
+  ENTERPRISE_MARKETING_URL: 'http://example.com',
+  ENTERPRISE_MARKETING_UTM_SOURCE: 'example.com',
+  ENTERPRISE_MARKETING_UTM_CAMPAIGN: 'example.com Referral',
+  ENTERPRISE_MARKETING_FOOTER_UTM_MEDIUM: 'Footer',
+  LEARNING_BASE_URL: 'http://localhost:2000',
+  SESSION_COOKIE_DOMAIN: 'localhost',
+  ZENDESK_KEY: '',
+  HOTJAR_APP_ID: '',
+  HOTJAR_VERSION: 6,
+  HOTJAR_DEBUG: '',
+  NEW_RELIC_APP_ID: '',
+  NEW_RELIC_LICENSE_KEY: '',
+  ACCOUNT_SETTINGS_URL: 'http://localhost:1997',
+  ACCOUNT_PROFILE_URL: 'http://localhost:1995',
+  ENABLE_NOTICES: '',
+  CAREER_LINK_URL: '',
+  OPTIMIZELY_FULL_STACK_SDK_KEY: '',
+  EXPERIMENT_08_23_VAN_PAINTED_DOOR: true,
+};

src/setupTest.jsx

@@ -67,6 +67,23 @@ jest.mock('@edx/frontend-platform/i18n', () => {
   };
 });
 
+/*
+When .env.test is removed, uncomment the env vars below and add any environment variables for testing with Jest
+
+Context: Snapshot is not currently set up to be able to parse the environment variables in env.config.js
+*/
+
+// jest.mock('@edx/frontend-platform', () => ({
+//   getConfig: jest.fn(() => ({
+//     LMS_BASE_URL: 'http://localhost:18000',
+//     LOGOUT_URL: 'http://localhost:18000/logout',
+//     LOGO_URL: 'https://edx-cdn.org/v3/default/logo.svg',
+//     MARKETING_SITE_BASE_URL: 'http://localhost:18000',
+//     SUPPORT_URL: 'http://localhost:18000/support',
+//     OPTIMIZELY_FULL_STACK_SDK_KEY: 'SDK Key',
+//   })),
+// }));
+
 jest.mock('@edx/paragon', () => jest.requireActual('testUtils').mockNestedComponents({
   Alert: {
     Heading: 'Alert.Heading',