new pkg: apptainer

[tuananh]

• add squashfs-tools which is a runtime dep for apptainer
• Need to echo a file named VERSION in order to use WOlfi's versioning (overriding in script/get-version script)

• can only do dummy test + a add remote test. can't do build yet because it requires squashfs-tools

Fixes: #40414

Related:

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• This PR is marked as fixing a pre-existing package request bug
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[tuananh]

@kranurag7 i think it's in ready state for review. can you take a look?

[tuananh]

@kranurag7 not sure how test fail. i tried apk add locally, run the test manually (copy the script) and it works

running make test/squashfs-tools resulted in core dump :-/

[tuananh]

@kranurag7 all is good i guess :)

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