Kindly consider using environment capability in term of using this brilliant in repo production.
Shown below link would be handy while try to update the code.

https://docs.docker.com/compose/environment-variables/set-environment-variables/

When i try to add other members to the group

for N in 2 3
do docker-compose exec node$N mysql -uroot -p@mypass \
  -e "change master to master_user='myuser' for channel 'group_replication_recovery';" \
  -e "START GROUP_REPLICATION;"
done

I have this error

2022-06-10T07:32:28.350709Z 0 [ERROR] [MY-011526] [Repl] Plugin group_replication reported: 'This member has more executed transactions than those present in the group. Local transactions: 245ddc6d-e889-11ec-963b-0242ac150003:1-6 > Group transactions: 245d2c96-e889-11ec-b50a-0242ac150002:1-11, 7b3cde30-e713-11ec-8b14-0242ac150099:1-5'

How do i fix this?

I was looking at adapting this to use for testing a driver but noticed you haven't included a license. Are you happy for your work to be used in this way and under what licensing conditions. If you just put this out for anyone to use MIT or BSD licenses do that.

The password supplied to the MYSQL_ROOT_PASSWORD is not logging me in to the container and no password is generated either from the log. Tried it over and over again... getting error error: 'Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)'