Recursively chowning the entire /app tree on startup is extremely slow
on network- or HDD-backed storage (e.g. TrueNAS Apps). The Next.js
standalone bundle and its node_modules contain tens of thousands of
tiny files, turning the advertised ~10s ownership step into 15+ minutes.
Only chown the paths the non-root user actually writes to at runtime:
the /appdata volume, the Next.js cache directory and the nginx runtime
directories. Application code, DB migrations and native modules are only
read/executed and stay owned by root.
The known /appdata subdirectories are created and their existing content
recursively re-owned before dropping privileges, so a persistent volume
with stale or root-owned entries stays writable after a PUID/PGID change.
These trees are small, unlike the /app tree.
Closes#2190
ajnart
95def954b7