New package: singularity-3.11.0

[snwnde]

This is based on the work of @olafmersmann, #28129.
When merged, this should close #8135.

Testing the changes

• I tested the changes in this PR: briefly

New package

• This new package conforms to the package requirements: YES

Local build testing

• I built this PR locally for my native architecture, (x86_64-glibc)

[classabbyamp]

why set the build_style when you override all the steps?

[snwnde]

I was trying to do minimal change to #28129, and I agree there is no need to set it.

Edit: actually, this is needed to get correct go env when doing cross compilation.

[snwnde]

Caution and tweaks for cross compilation.

• The configuration script ./mconf needs GOARCH set to the host architecture to run.
• ./mconf tries to build and run some test codes. While building can be done with another architecture, the execution is not possible AFAIK. See this line. We have to remove this block from the check script.
• We can remove that block to proceed and get a Makefile. A Makefile target called codegen again needs host GOARCH.
• Cross compilation with cgo requires specifying -extld in go ldflags.

This does not solve all the problems, and I am unwilling to go down the rabbit hole. If someone is interested in looking at this, this template file should be a good start.

@classabbyamp Could we make this an x86-64 only package? Given that binaries released by upstream are also only built for this architecture (https://github.com/sylabs/singularity/releases). If a native build for aarch64 can be tested, this can also be included.

[github-actions]

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