feature: support PUID/PGID to change user (#655)

entrypoint.sh

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+set -e
+
+if ! [[ "$PUID" =~ ^[0-9]+$ ]] || ! [[ "$PGID" =~ ^[0-9]+$ ]]; then
+  echo "[entrypoint] ERROR: PUID and PGID must be numeric integers." >&2
+  exit 1
+fi
+
+# If PUID is not set or is 0, run as root (backwards-compatible default)
+if [ -z "$PUID" ] || [ "$PUID" -eq 0 ]; then
+  if [ -n "$UMASK" ]; then
+    umask "$UMASK"
+  fi
+  if [ $# -eq 0 ]; then
+    set -- bun run dist/src/index.js
+  fi
+  exec "$@"
+fi
+
+PGID=${PGID:-$PUID}
+UMASK=${UMASK:-002}
+
+umask "$UMASK"
+
+if [ "$PGID" -ne "$(id -g convertx)" ]; then
+  groupmod -o -g "$PGID" convertx
+fi
+
+if [ "$PUID" -ne "$(id -u convertx)" ]; then
+  usermod -o -u "$PUID" convertx
+fi
+
+# Ensure home directory exists and is owned by convertx
+mkdir -p /home/convertx
+if [ "$(stat -c '%u:%g' /home/convertx)" != "$PUID:$PGID" ]; then
+  chown -R convertx:convertx /home/convertx
+fi
+
+# Ensure /app/data exists and fix permissions only if the mount point ownership differs
+mkdir -p /app/data
+if [ "$(stat -c '%u:%g' /app/data)" != "$PUID:$PGID" ]; then
+  find /app/data \( ! -user "$PUID" -o ! -group "$PGID" \) -exec chown -h "$PUID:$PGID" '{}' +
+fi
+
+export HOME=/home/convertx
+
+if [ $# -eq 0 ]; then
+  set -- bun run dist/src/index.js
+fi
+
+exec gosu convertx "$@"
+