In this implementation, the `TZ` environment variable must be set
in order for the formatted output to use a more user-friendly
time zone abbreviation (e.g., `UTC`). Otherwise, the output uses
the time zone's UTC offset (e.g., `+00:00`).
This is useful for making local customizations upon container start. To use
this feature, mount a script into the container as `/etc/bitwarden_rs.sh`
and/or a directory of scripts as `/etc/bitwarden_rs.d`. In the latter case,
only files with an `.sh` extension are sourced, so files with other
extensions (e.g., data/config files) can reside in the same dir.
Note that the init scripts are run each time the container starts (not just
the first time), so these scripts should be idempotent.
* Make `SIGNUPS_DOMAINS_WHITELIST` override the `SIGNUPS_ALLOWED` setting.
Otherwise, a common pitfall is to set `SIGNUPS_DOMAINS_WHITELIST` without
realizing that `SIGNUPS_ALLOWED=false` must also be set.
* Whitespace is now accepted in `SIGNUPS_DOMAINS_WHITELIST`. That is,
`foo.com, bar.com` is now equivalent to `foo.com,bar.com`.
* Add validation on `SIGNUPS_DOMAINS_WHITELIST`. For example, `foo.com,`
is rejected as containing an empty token.
Ignore a missing `id` query param; it's unclear what this ID represents,
but it wasn't being used in the existing bitwarden_rs code, and no longer
seems to be sent in the latest versions of the official clients.
Jeremy Lin