Problem solved YAY!!!!!!!

it was a problem when it got to /home which does not properly exist - I do not know how these bind mounts work on an OS level so cant explain exactly the reason for the issue...

However, changing cpanm build directory to another location which is done using an env variable:

export PERL_CPANM_HOME=/opt/app/.cpanm
[download]

So issue closed for me!