Add testing under a crippled FS#279

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yarikoptic wants to merge 3 commits intodatalad:masterfrom

yarikoptic:enh-add-crippledtesting

Commits on Mar 8, 2026

[DATALAD RUNCMD] Add crippled-filesystems CI run from the extension-template
yarikoptic
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Install singularity for test_crippledfs.yml
yarikoptic
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Boost version of git-annex to currently minimal required as of 1.2.3
yarikoptic
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