add env var for API rate limit max

[itsgrimetime]

Features and Changes

Adds an environment variable to allow configuring API rate limit max

Dependencies

N/A

Testing

1. Run locally w/ yarn:dev
2. Login & create API key
3. run something like time while true do; curl ...; done in a loop on any API endpoint to see rate limiting occuring after some time
4. set API_RATE_LIMIT_MAX env var and restart backend app
5. repeat step 3 and see that it takes... longer :)

Screenshots

[jdorn]

Thanks for adding this!