fix: change location of custom init scripts (filebrowser#3493)

Co-authored-by: niraami <[email protected]>

Author: niraami

docker/root/etc/cont-init.d/20-config renamed to docker/root/custom-cont-init.d/20-config

@@ -12,4 +12,4 @@ fi
 chown abc:abc \
 	/config/settings.json \
 	/database \
-	/srv
+	/srv