Alleged permission issue regarding logfile (readonly) #283

Describe the bug
Starting a container with image tag 4-bullseye and env variables FHEM_UID and FHEM_GID set to a non-default value, FHEM gives the following error message:
Messages collected while initializing FHEM:configfile: logfile is readonly, it is set in the FHEM_GLOBALATTR environment

However, the logfile is writeable without any problems. Also, all permissions get set correctly (i.e. entry.sh is doing its job correctly).

To Reproduce
Steps to reproduce the behavior:

1. Set FHEM_UID and FHEM_GID to some non-default value
2. Start container
3. Observe reading init_errors in device global
4. Observe logfile and notice it is being written to despite the error message
5. Change to 3-bullseye and observe that error message vanishes

Expected behavior
No error message

Additional context
Another user reported that they also get an error message for the PID file. This first occurred after switching from 3-bullseye to 4-bullseye.
See here (also see following forum posts for additional context).

Also, I am not sure if this is an issue within fhem.pl or with the container environment, however, given that the issue was not present in 3-bullseye I am assuming it is an issue with the code in this repo, rather than FHEM itself.

For the sake of completeness, here is the content of /proc/$PID/environ:
SHELL=/bin/bashFHEM_GLOBALATTR=nofork=0 updateInBackground=1 logfile=log/fhem-%Y-%m-%d.log pidfilename=log/fhem.pidHOSTNAME=ha_fhemtestLANGUAGE=en_US:enPERL_JSON_BACKEND=Cpanel::JSON::XS,JSON::XS,JSON::PP,JSON::backportPPLC_ADDRESS=de_DE.UTF-8LC_NAME=de_DE.UTF-8LC_MONETARY=de_DE.UTF-8UMASK=0037PWD=/opt/fhemLOGNAME=fhemTZ=Europe/BerlinLOGFILE=/opt/fhem/log/fhem-%Y-%m-%d.logHOME=/opt/fhemFHEM_UID=7073LANG=en_US.UTF-8LC_PAPER=de_DE.UTF-8PERL5LIB=/usr/src/app/core/lib/perl5:/usr/src/app/3rdparty/lib/perl5GPIO_GID=6002FHEM_GID=7067TERM=xtermUSER=fhemCONFIGTYPE=fhem.cfgDOCKER_GW=172.21.0.1I2C_GID=6003TIMEOUT=10SHLVL=1LC_TELEPHONE=de_DE.UTF-8LC_MESSAGES=en_DK.UTF-8LC_MEASUREMENT=de_DE.UTF-8FHEM_PERM_FILE=0640LC_TIME=de_DE.UTF-8DOCKER_HOST=172.21.0.1PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/binTELNETPORT=7072DOCKER_HOSTNETWORK=0MAIL=/var/mail/fhemFHEM_PERM_DIR=0750BLUETOOTH_GID=6001LC_NUMERIC=de_DE.UTF-8DOCKER_PRIVILEGED=1OLDPWD=/opt/fhem_=/usr/local/bin/perlroot