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fix(functions): set nofile ulimit for Edge Runtime container (#5152)

* fix(functions): set nofile ulimit for Edge Runtime container

The Edge Runtime container was started with Docker's default nofile
ulimit (1024 soft), causing "Too many open files" errors for projects
with 200+ Edge Functions running long dev sessions.

Set nofile ulimit to 65536 (soft and hard) to allow sufficient file
descriptors for Deno isolates handling many concurrent functions.

Fixes #5151

Signed-off-by: wucm667 <stevenwucongmin@gmail.com>

* chore: add comment internal/functions/serve/serve.go

* chore: fix comment indent

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Signed-off-by: wucm667 <stevenwucongmin@gmail.com>
Co-authored-by: Andrew Valleteau <avallete@users.noreply.github.com>

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