a84c968c

By: Michael Lynch <git@mtlynch.io>

Add --s3 flag to dev-scripts/serve

When running `dev-scripts/serve --s3`, air passes
`-s3-config configs/s3.dev.cfg` to the app binary.
Without the flag, air passes `-media-dir data/media`.

Co-authored-by: Shelley <shelley@exe.dev>