The password now lives in CADPRox_Secrets (mode 600, git-ignored) and is
mounted read-only into the container, rather than being read from the
compose file. Two reasons:
- the password contains '#', which YAML reads as the start of a comment,
so putting it in docker-compose.yml was never going to work;
- anything in the compose file is visible in `docker compose config` and
`docker inspect`, and would be easy to commit by accident.
read_secrets_file() accepts either a bare password on one line, which is
the common case, or a key=value file so the same file can hold more than
one secret later. A bare password containing '=' is not mangled, because
the key/value parse only wins when it recognises one of its own keys.
Also detect a bind mount whose source is missing. Docker creates a
directory in that case, which would otherwise fail confusingly and
quietly leave the app with no password.
The port stays CADPROX_PORT in the compose file and is deliberately not
added to ports:. Publishing a port needs bridge networking, which cannot
reach Caddy's admin API on 127.0.0.1:2019, and Docker discards a ports:
entry under host mode with only a warning - so it would read as a mapping
that is not there. Documented in the README instead.
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