env AUTH_REGISTRIES_RAW

[netikras]

Adding an ability to specify raw contents of /etc/nginx/docker.auth.map. Can be used along with AUTH_REGISTRIES if needed.

providing raw contents of the auth.map file allows me to

• hide plain-text credentials from the ps -ef output
• reuse existing auth.map file as-is, w/o needing to parse and reformat it into host:user:pass format