Setup test, break apart entrypoint, & align GHA workflow

backend/src/services/smtp.ts

@@ -0,0 +1,33 @@
+import nodemailer from 'nodemailer';
+import { SMTP_HOST, SMTP_PORT, SMTP_USERNAME, SMTP_PASSWORD } from '../config';
+import SMTPConnection from 'nodemailer/lib/smtp-connection';
+import * as Sentry from '@sentry/node';
+
+const mailOpts: SMTPConnection.Options = {
+  host: SMTP_HOST,
+  port: SMTP_PORT as number
+};
+if (SMTP_USERNAME && SMTP_PASSWORD) {
+  mailOpts.auth = {
+    user: SMTP_USERNAME,
+    pass: SMTP_PASSWORD
+  };
+}
+
+export const initSmtp = () => {
+  const transporter = nodemailer.createTransport(mailOpts);
+  transporter
+    .verify()
+    .then(() => {
+      Sentry.setUser(null);
+      Sentry.captureMessage('SMTP - Successfully connected');
+    })
+    .catch((err) => {
+      Sentry.setUser(null);
+      Sentry.captureException(
+        `SMTP - Failed to connect to ${SMTP_HOST}:${SMTP_PORT} \n\t${err}`
+      );
+    });
+
+  return transporter;
+};