Automate adding new public DSACMS repos to metrics reports?

## Problem
`projects_tracked.json` needs to be manually updated when a new public repo is released

## Solution
We could create a GitHub action that will run on a weekly basis that checks each of our tracked orgs for new public repositories that are not currently being tracked. We could also check for whether those repos contain a code.json file, as a 'confirmation' that they are 'ready' to be ingested into the metric site?

## Resources
https://github.com/DSACMS/metrics/blob/main/scripts/_metadata/projects_tracked.json