Error echoing /etc/hosts file as it is read-only

[Whoops-Aurora]

when executing queens and victoria I came across error during building the dockerfile line 27 at keystone.sh I getr this error in docker

187.8 + echo '127.0.0.1 openstack-controller'
187.8 /root/install_scripts/keystone.sh: line 27: /etc/hosts: Read-only file system

Dockerfile:23

21 | ADD install_scripts/keystone.conf /root/install_scripts/keystone.conf
22 | ADD install_scripts/keystone.sh /root/install_scripts/keystone.sh
23 | >>> RUN /bin/bash /root/install_scripts/keystone.sh
24 |
25 | # nova

ERROR: failed to solve: process "/bin/sh -c /bin/bash /root/install_scripts/keystone.sh" did not complete successfully: exit code: 1