This patch provides input arguments `newuidmapPath` and `newgidmapPath`
for apptainer and singularity to specify the path to the SUID-ed executables
newuidmap and newgidmap where they are not available from the FHS PATH.
As NixOS places those suided executables in a non-FHS position
(/run/wrapper/bin), this patch provides
programs.singularity.enableFakeroot option and implement with the above
input parameters.
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