Adding non-standard ways to use EESSI

[hvelab]

As per this issue: https://gitlab.com/eessi/support/-/issues/119

First batch regarding the cvmfsexec usage. A couple of thoughts:

• Should we add the cvmfsexec_eessi.sh and the orted wrapper in some repo so people can directly clone and not have to copy-paste it?
• Worked fine in my local Ubuntu 22.04 and a remote Rocky Linux test environment,. For some colleagues I asked to test in their locals (Ubuntu 23), this error msg occured:

 $ ./test.sh ls /cvmfs/software.essi.io
/tmp/rzarco/tmp.sdsrKCrQH7/cvmfsexec/dist should be rpm2cpio of cvmfs rpm
mountrepo software.eessi.io failed

Not sure why it mentions rpm if its a deb system, specially if in my ubuntu worked. Tbh I think their environment was polluted by some local testing they were doing and we will try again later, but I paste it here just to have it in mind in case we see it again.

[ocaisa]

cvmfsexec only works for RHEL-like systems 😢

[hvelab]

cvmfsexec only works for RHEL-like systems 😢

True, in my Ubuntu works but seems that its because I have CVMFS already available, I tested it in other systems without CVMFS and the same error message shows :(