💡 Added database upgrade warning for required MySQL 8 in Ghost 5.0

no issue

- Ghost 5.0 will require MySQL 8 when running in production so we've added a warning to the whats new/about screen to give some visibility for self-hosters to prepare
- updated `whatsnew` controller to native class syntax

ghost/admin/app/controllers/whatsnew.js

@@ -1,17 +1,26 @@
 import Controller from '@ember/controller';
-import {computed} from '@ember/object';
 import {inject as service} from '@ember/service';
 
-/* eslint-disable ghost/ember/alias-model-in-controller */
-export default Controller.extend({
-    config: service(),
-    upgradeStatus: service(),
-    whatsNew: service(),
+export default class WhatsNewController extends Controller {
+    @service config;
+    @service upgradeStatus;
+    @service whatsNew;
 
-    queryParams: ['entry'],
+    queryParams = ['entry'];
 
-    copyrightYear: computed(function () {
-        let date = new Date();
+    get copyrightYear() {
+        const date = new Date();
         return date.getFullYear();
-    })
-});
+    }
+
+    get showDatabaseWarning() {
+        const isProduction = !!this.config.get('environment').match?.(/production/i);
+        const isPro = !!this.config.get('hostSettings')?.siteId;
+
+        if (isProduction && !isPro) {
+            return true;
+        }
+
+        return false;
+    }
+}

ghost/admin/app/templates/whatsnew.hbs

@@ -40,6 +40,7 @@
                 <div class="gh-about-logo">
                     {{svg-jar "ghost-logo-orb" alt="Ghost"}}
                 </div>
+
                 {{#if this.upgradeStatus.message}}
                     <section class="gh-upgrade-notification">
                         <p>
@@ -47,6 +48,7 @@
                         </p>
                     </section>
                 {{/if}}
+
                 <ul class="gh-env-list">
                     <li><strong>Version:</strong> {{this.config.version}}</li>
                     <li><strong>Environment:</strong> <span class="ttc">{{this.config.environment}}</span></li>
@@ -56,6 +58,15 @@
                     <li><strong>Developer experiments:</strong> <span class="gh-badge">Enabled</span></li>
                     {{/if}}
                 </ul>
+
+                {{#if this.showDatabaseWarning}}
+                    <section class="gh-upgrade-notification">
+                        <p>
+                            <strong>Warning:</strong> MySQL 8 will be the required database in the next major release of Ghost. Make sure your database is up to date to ensure forwards compatibility.
+                        </p>
+                    </section>
+                {{/if}}
+
                 <footer class="gh-copyright-info">
                     Copyright &copy; 2013 &ndash; {{this.copyrightYear}} Ghost Foundation, released under the <a href="https://github.com/TryGhost/Ghost/blob/master/LICENSE" target="_blank">MIT license</a>. <a href="https://ghost.org/" target="_blank">Ghost</a> is a registered trademark of <a href="https://ghost.org/trademark/" target="_blank">Ghost Foundation Ltd</a>.
                 </footer>