Add docker-entrypoint.sh that runs as root at startup, fixes ownership
of the DATA_DIR volume (only files with wrong user or group), then drops
to the non-root sencho user via su-exec before starting Node.
This eliminates the SQLITE_READONLY crash that occurs when a host-mounted
data volume was created by root or chowned to the wrong UID. The pattern
mirrors the official PostgreSQL, Redis, and MariaDB Docker images.
- Install su-exec in Stage 3 (10KB Alpine tool, idiomatic alternative to gosu)
- Remove USER directive; entrypoint handles the privilege drop instead
- Use ENTRYPOINT + CMD so Node becomes PID 1 (correct SIGTERM handling)
- Add .gitattributes to enforce LF line endings for *.sh files
SaelixCode