10-listen-on-ipv6-by-default.sh: info: can not modify /etc/nginx/conf.d/default.conf (read-only file system?)

[KortexSys]

shlink-web-client version

4.6.2

How do you use shlink-web-client

Docker image

Current behavior

I try to start a container shlinkio/shlink-web-client v4.6.2 which has an IPv6.

The script 10-listen-on-ipv6-by-default.sh is supposed to modify the Nginx listen directive but I receive this error:

/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
10-listen-on-ipv6-by-default.sh: info: can not modify /etc/nginx/conf.d/default.conf (read-only file system?)

I haven't analyzed it in depth, but I have a feeling it's related to file /etc/nginx/conf.d/default.conf permissions:

$ ls -al /etc/nginx/conf.d/default.conf
-rw-r--r--    1 root     root          1446 Dec 12 07:38 /etc/nginx/conf.d/default.conf

As the container is running as nginx:

$ id
uid=101(nginx) gid=101(nginx) groups=101(nginx)

Expected behavior

The script /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh is supposed to work (= to be able to modify the Nginx default.conf configuration file).

Minimum steps to reproduce

Start a container on a virtual machine which has an IPv6