title: Firebase Function .pubsub.schedule first weekday of month
body: <p>I want to run my scheduled firebase function on the first weekday of each month.</p>
  <p>I have tried <code>.pubsub.schedule(&quot;0 9 1W * *&quot;)</code>, <code>.pubsub.schedule(&quot;0 9 * * 1W&quot;)</code>, and <code>.pubsub.schedule('0 9 1W * ?')</code> all of which do not work.</p>