chanzuckerberg / miniwdl / 24919917292

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fix: guard against out-of-range uid/gid in Docker Swarm backend (#839)

Docker requires uid and gid values to be in the range 0-2147483647
(signed 32-bit). The supplementary group (os.getegid()) was added
unconditionally to every container, causing failures for users whose
gid exceeds this limit (e.g. on GCP VMs with Google-managed accounts).

Skip the supplementary group when the gid is out of range, and raise
a clear error when --as-me is used with an out-of-range uid or gid.

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