Fix build error with --build-template conda/micromamba:v2 for singularity

[munishchouhan]

Problem:
Singularity builds fail with tar errors when extracting conda packages:
tar: conda/pkgs/...: Cannot change mode to rwxrwxr-x: No such file or directory

Root Cause:
Conda's pkgs/ cache contains dangling symlinks. When tar extracts and tries to chmod these symlinks, Linux applies chmod to the (non-existent) target, causing "No such
file or directory" errors. The symlinks are created successfully - only the chmod fails.

Solution:
Suppress harmless tar errors with 2>/dev/null || true. The extraction succeeds and conda environments function correctly.

Changes:

• Updated tar commands in conda-micromamba-v2/singularityfile-conda-file.txt
• Updated tar commands in conda-pixi-v1/singularityfile-conda-file.txt
• Updated corresponding tests in TemplateUtilsTest.groovy

[pditommaso]

is there any tar options that could provide an alternative solution? bit concerned about shallowing stderr in case of error (and returning

[munishchouhan]

is there any tar options that could provide an alternative solution? bit concerned about shallowing stderr in case of error (and returning

I tired multiple flags but no luck

--delay-directory-restore 
        --no-same-owner 
        --no-same-permissions 

This error could be because of proot
I think we should use single stage build for singularity builds

[munishchouhan]

because even i make a workaround where we just ignore this exception, may lead to brocker env

[munishchouhan]

and not using tar also decreases the build time