feat: Add conditional MAIL_HOST validation, lazy-load mailer, and update Gitea workflow to use vars for mail and Sentry environment variables.

lib/mail/mailer.ts

@@ -3,15 +3,27 @@ import { getServerAppServices } from '@/lib/services/create-services.server';
 import { config } from '../config';
 import { ReactElement } from 'react';
 
-const transporter = nodemailer.createTransport({
-  host: config.mail.host,
-  port: config.mail.port,
-  secure: config.mail.port === 465,
-  auth: {
-    user: config.mail.user,
-    pass: config.mail.pass,
-  },
-});
+let transporterInstance: nodemailer.Transporter | null = null;
+
+function getTransporter() {
+  if (transporterInstance) return transporterInstance;
+
+  if (!config.mail.host) {
+    throw new Error('MAIL_HOST is not configured. Please check your environment variables.');
+  }
+
+  transporterInstance = nodemailer.createTransport({
+    host: config.mail.host,
+    port: config.mail.port,
+    secure: config.mail.port === 465,
+    auth: {
+      user: config.mail.user,
+      pass: config.mail.pass,
+    },
+  });
+
+  return transporterInstance;
+}
 
 interface SendEmailOptions {
   to?: string | string[];
@@ -32,7 +44,7 @@ export async function sendEmail({ to, subject, html }: SendEmailOptions) {
   const logger = getServerAppServices().logger.child({ component: 'mailer' });
 
   try {
-    const info = await transporter.sendMail(mailOptions);
+    const info = await getTransporter().sendMail(mailOptions);
     logger.info('Email sent successfully', { messageId: info.messageId, subject, recipients });
     return { success: true, messageId: info.messageId };
   } catch (error) {