chore: make cache config follow slack notification config

Signed-off-by: Heikki Hellgren <heikki.hellgren@op.fi>

plugins/notifications-backend-module-email/README.md

@@ -20,7 +20,9 @@ notifications:
       sender: 'sender@mycompany.com'
       replyTo: 'no-reply@mycompany.com'
       broadcastConfig:
-        receiver: 'user'
+        receiver: 'users'
+      cache:
+        ttl: 60000
 ```
 
 See `config.d.ts` for more options for configuration.

plugins/notifications-backend-module-email/config.d.ts

@@ -105,10 +105,12 @@ export interface Config {
            */
           receiverEmails?: string[];
         };
-        /**
-         * Email cache TTL, defaults to 1 hour
-         */
-        cacheTtl?: number;
+        cache?: {
+          /**
+           * Email cache TTL, defaults to 1 hour
+           */
+          ttl?: number;
+        };
       };
     };
   };

plugins/notifications-backend-module-email/src/processor/NotificationsEmailProcessor.ts

@@ -58,7 +58,7 @@ export class NotificationsEmailProcessor implements NotificationProcessor {
       config.getOptionalString('notifications.email.format') ?? 'html';
     this.replyTo = config.getOptionalString('notifications.email.replyTo');
     this.cacheTtl =
-      config.getOptionalNumber('notifications.email.cacheTtl') ?? 3_600_000;
+      config.getOptionalNumber('notifications.email.cache.ttl') ?? 3_600_000;
   }
 
   private async getTransporter() {