fix: correct Fedora 40 detection, and be more verbose about version

[ABotelho23]

The below snippet from 1_prune.sh:

# Merge /usr/etc to /etc
# OSTree will error out if both dirs exist
# And rpm-ostree will be confused and use only one of them
if [ -d ./usr/etc ]; then
    echo
    echo WARNING: FOUND /usr/etc. MERGING TO ETC FOR COMPATIBILITY
    echo EXPECT PERMISSIONS ISSUES ON THE MERGED PATHS
    echo The following files from /usr/etc will be merged to /etc:
    tree ./usr/etc

    echo
    $RSYNC ./usr/etc/ ./etc
    rm -rf ./usr/etc
fi

# Move /etc to /usr/etc
mv ./etc ./usr/

seems to tell me that there is no /etc/os-release, only a /usr/etc/os-release, which means Fedora 40 images have been getting "detected" as "Fedora 40".

I've also added some output for when Fedora 41+ gets detected.

[antheas]

you only replaced the -f check and left the check below as is

[ABotelho23]

yup, one sec

[ABotelho23]

Fixed.