Setup test, break apart entrypoint, & align GHA workflow

backend/src/services/database.ts

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+/* eslint-disable no-console */
+import mongoose from 'mongoose';
+
+export const initDatabase = (MONGO_URL: string) => {
+  mongoose
+    .connect(MONGO_URL)
+    .then(() => console.log('Successfully connected to DB'))
+    .catch((e) => {
+      console.log('Failed to connect to DB ', e);
+      setTimeout(() => {
+        console.log(e);
+      }, 5000);
+    });
+  return mongoose.connection;
+};

backend/src/services/health.ts

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+/* eslint-disable no-console */
+import mongoose from 'mongoose';
+import { createTerminus } from '@godaddy/terminus';
+
+export const setUpHealthEndpoint = <T>(server: T) => {
+  const onSignal = () => {
+    console.log('Server is starting clean-up');
+    return Promise.all([
+      () => {
+        if (mongoose.connection && mongoose.connection.readyState == 1) {
+          mongoose.connection.close();
+          () => {
+            console.info('Database connection closed');
+          };
+        }
+      }
+    ]);
+  };
+
+  const healthCheck = () => {
+    // `state.isShuttingDown` (boolean) shows whether the server is shutting down or not
+    // optionally include a resolve value to be included as info in the health check response
+    return Promise.resolve();
+  };
+
+  createTerminus(server, {
+    healthChecks: {
+      '/healthcheck': healthCheck,
+      onSignal
+    }
+  });
+};

backend/src/services/smtp.ts

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+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;
+};