Invalid publish opts format

[greendog]

My .env file is:

AUTHN_URL=http://example.auth
...
...

I have an error here:

authn-demo/authn

Line 6 in 87ed15f

--publish ${AUTHN_URL##*:}:3000 \

docker: invalid publish opts format (should be name=value but got 'http://example.auth:3000').
See 'docker run --help'.

In the documentation: https://docs.docker.com/engine/reference/commandline/run/#publish-or-expose-port--p---expose I see:

docker run -p 127.0.0.1:80:8080/tcp ubuntu bash


This binds port 8080 of the container to TCP port 80 on 127.0.0.1 of the host machine. You can also specify udp and sctp ports. The Docker User Guide explains in detail how to manipulate ports in Docker.

I was able to run the Authn following way.
I'm change a authn file as:

docker run -it --rm \
  --publish 127.0.0.1:3000:3000 \

but now I have other error - a # form makes request to http://example.auth/accounts (without 3000 port)