logging does not work in all configuration cases

Hi, i figured out that there seems to be some issue with the setting of the logging of BFFH:

the following settings will make bffh correctly talkative (trace level):

export BFFH_LOG=trace; /opt/fabinfra/bffh/target/release/bffhd --config /opt/fabinfra/bffh-data/config/cfg.dhall

BFFH_LOG=trace /opt/fabinfra/bffh/target/release/bffhd --config /opt/fabinfra/bffh-data/config/cfg.dhall

i put this into my systemd file:

[Unit]
Description=FabAccess BFFH Service
After=network.target
 
[Service]
Type=simple
User=bffh
Group=root
ExecStartPre=/opt/fabinfra/bffh/target/release/bffhd --check --config /opt/fabinfra/bffh-data/config/cfg.dhall
Environment="BFFH_LOG=warn"
ExecStart=/opt/fabinfra/bffh/target/release/bffhd --verbose --config /opt/fabinfra/bffh-data/config/cfg.dhall --log-format Full
Restart=on-failure
RestartSec=30
ExecStopPost=/usr/bin/bash /opt/fabinfra/fabaccess-bffh-state.sh $EXIT_CODE
 
[Install]
WantedBy=multi-user.target

while the following settings do not apply to print proper output:

/opt/fabinfra/bffh/target/release/bffhd --config /opt/fabinfra/bffh-data/config/cfg.dhall --log-level trace

or setting it in config.dhall, like the docs say: via BFFH_LOG="trace",

See https://fab-access.readthedocs.io/en/v0.3/configuration/log_config.html and the output of bffhd:

diflouroborane 0.4.2


USAGE:
    bffhd [OPTIONS]

OPTIONS:
    -c, --config <config>            Path to the config file to use
        --check                      Check config for validity
        --dump                       Dump all internal databases
        --dump-users <FILE>          Dump the users db to the given file as TOML
        --force                      force ops that may clobber
    -h, --help                       Print help information
        --load <load>                Load values into the internal databases
        --log-format <log format>    Use an alternative log formatter. Available: Full, Compact,
                                     Pretty [possible values: Full, Compact, Pretty]
        --log-level <log level>      Set the desired log levels.
        --print-default              Print a default config to stdout instead of running
        --quiet                      Decrease logging verbosity
        --tls-key-log [<PATH>...]    log TLS keys into PATH. If no path is specified the value of
                                     the envvar SSLKEYLOGFILE is used.
    -v, --verbose                    Increase logging verbosity
    -V, --version                    Print version information