chore(docker): add entrypoint script and user permissions

entrypoint.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+set -e
+
+# Default to UID/GID 1000 if not provided
+PUID=${PUID:-1000}
+PGID=${PGID:-1000}
+# Default umask to 022 if not provided
+UMASK=${UMASK:-022}
+
+echo "Starting with UID: $PUID, GID: $PGID, UMASK: $UMASK"
+
+# Set umask
+umask "$UMASK"
+
+# Create group with specified GID
+groupadd -g "$PGID" appgroup 2>/dev/null || true
+
+# Create user with specified UID and GID
+useradd -u "$PUID" -g "$PGID" -d /home/appuser -s /bin/bash appuser 2>/dev/null || true
+
+# Create home directory if it doesn't exist
+mkdir -p /home/appuser
+chown "$PUID:$PGID" /home/appuser
+
+# Fix permissions on /config if it exists
+if [ -d "/config" ]; then
+    echo "Setting up /config directory permissions"
+    # Change ownership of /config and all its contents to PUID:PGID
+    # This ensures files created by different UIDs are accessible
+    chown -R "$PUID:$PGID" /config
+fi
+
+# Execute the main command as the specified user
+echo "Starting application as user $PUID:$PGID"
+exec gosu "$PUID:$PGID" "$@"