Also, move postgrest service + deployment into a separate manifest
file, which is deployed via a separate script, `deploy-postgrest`.
This way, we don't have unused postgrest instances in preview and
nightly, since those use the prod database.
Co-authored-by: Conrad <conrad@zed.dev>
Over time, I think we may end up having multiple services, so it seems like a good opportunity to name this one more specifically while the cost is low. It just seems like naming it "zed" and "zed-server" leaves it a bit open ended.