[bug#31592] [PATCH 2/4] gnu: Add singularity.

[Danny Milosavljevic]

Hi Ricardo,

I've tested this by installing it into my user profile and then invoking

  singularity

and I get:

/gnu/store/18xq9sc79j81zlzhdm7kamq71vlivi59-singularity-2.5.1/libexec/singularity/cli/help.exec:
 line 48: cat: command not found

GENERAL COMMANDS:
/gnu/store/18xq9sc79j81zlzhdm7kamq71vlivi59-singularity-2.5.1/libexec/singularity/cli/help.exec:
 line 62: egrep: command not found

CONTAINER USAGE COMMANDS:
/gnu/store/18xq9sc79j81zlzhdm7kamq71vlivi59-singularity-2.5.1/libexec/singularity/cli/help.exec:
 line 73: egrep: command not found

CONTAINER MANAGEMENT COMMANDS:
/gnu/store/18xq9sc79j81zlzhdm7kamq71vlivi59-singularity-2.5.1/libexec/singularity/cli/help.exec:
 line 84: egrep: command not found

COMMAND GROUPS:
/gnu/store/18xq9sc79j81zlzhdm7kamq71vlivi59-singularity-2.5.1/libexec/singularity/cli/help.exec:
 line 95: egrep: command not found


/gnu/store/18xq9sc79j81zlzhdm7kamq71vlivi59-singularity-2.5.1/libexec/singularity/cli/help.exec:
 line 106: cat: command not found


That's because there's a PATH="/bin..." inside 
/home/dannym/.guix-profile/bin/singularity .