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Add support for custom container user permissions via PUID and PGID environment variables. When the container is started as root (--user root), the pgadmin user is reassigned to the requested UID/GID and all initialization runs under that user via su-exec, ensuring files are created with correct ownership from the start. Key changes: - Dockerfile: add su-exec package, add chmod g=u for /run/pgadmin (fixes OpenShift random UID access) - entrypoint.sh: add PUID/PGID validation and privilege dropping before initialization (not after), preserving OpenShift compatibility Three modes supported: - Default (USER 5050): unchanged behavior - Custom UID (--user root -e PUID=N -e PGID=N): drops to target user before any init - OpenShift (random UID, GID 0): passwd fixup + group permissions