added configurable temporary banner

Author: murtaza-swati

app/components/temporary-announcement-banner.js

@@ -0,0 +1,13 @@
+import Component from '@ember/component';
+import config from 'travis/config/environment';
+
+export default Component.extend({
+  message: '',
+  enabled: false,
+
+  init() {
+    this._super(...arguments);
+    this.set('enabled', config.tempBanner.tempBannerEnabled === 'true');
+    this.set('message', config.tempBanner.tempBannerMessage || '');
+  }
+});

app/templates/components/temporary-announcement-banner.hbs

@@ -0,0 +1,5 @@
+{{#if this.enabled}}
+  <div class="notice-banner--yellow align-center">
+    {{this.message}}
+  </div>
+{{/if}}

app/templates/components/top-bar.hbs

@@ -21,6 +21,7 @@
 {{#if this.features.enterpriseVersion}}
   <EnterpriseBanner />
 {{/if}}
+<TemporaryAnnouncementBanner />
 {{#if this.user}}
   <RepositorySecurityBanner />
 {{/if}}

config/environment.js

@@ -30,7 +30,9 @@ const {
   DISABLE_SENTRY,
   TRAVIS_COMMIT,
   SOURCE_VERSION,
-  DEPLOY_TARGET
+  DEPLOY_TARGET,
+  TEMPORARY_ANNOUNCEMENT_BANNER_ENABLED,
+  TEMPORARY_ANNOUNCEMENT_MESSAGE
 } = process.env;
 
 module.exports = function (environment) {
@@ -171,6 +173,10 @@ module.exports = function (environment) {
     gReCaptcha: {
       siteKey: GOOGLE_RECAPTCHA_SITE_KEY
     },
+    tempBanner: {
+      tempBannerEnabled: TEMPORARY_ANNOUNCEMENT_BANNER_ENABLED || false,
+      tempBannerMessage: TEMPORARY_ANNOUNCEMENT_MESSAGE || ''
+    }
   };
 
   ENV.metricsAdapters = [];