Alleged permission issue regarding logfile (readonly)

**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](https://forum.fhem.de/index.php?topic=89745.msg1327239#msg1327239) (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`