Add email integration to be able to broadcast emails to all users.

Resolves #388

app/api/src/services/email/email.ts

@@ -0,0 +1,18 @@
+import { requireAuth } from 'src/lib/auth'
+import {sendMail} from 'src/lib/sendmail'
+import {users} from 'src/services/users/users'
+
+export const sendAllUsersEmail = async ({input: {body, subject}}) => {
+  requireAuth({ role: 'admin' })
+  const recipients = (await users()).map(({email}) => email)
+  const from = {
+    address:'news@mail.cadhub.xyz',
+    name: 'CadHub',
+  }
+  return sendMail({
+    to: recipients,
+    from,
+    subject,
+    text: body,
+  })
+}