Hint on development environments

Why?

Allows to have a visual hint by environment to prevent funny debugging moments.

How?

Setup the NEXT_PUBLIC_DEV_ENV_NAME and NEXT_PUBLIC_DEV_ENV_COLOR_SCHEME env variables with the name of the environment and the wanted hint color.

NEXT_PUBLIC_DEV_ENV_NAME=staging
NEXT_PUBLIC_DEV_ENV_COLOR_SCHEME=teal