Unable to start php-fpm - "cannot get uid for user 'apache'"

The apache user comes from php-fpm.conf file. It does not matter that you run it as root, the service will start as the user which is configured in this file.

Find your php-fpm.conf file. It should be somwhere in /etc. Edit it and change lines

user = apache
group = apache

to

user = www-data
group = www-data

I'm assuming your default nginx configuration also uses the www-data user.

For a docker OpenShift no root way, prepare groups in build

vim /etc/groups

e.g. nobody:x:999:

it's after some update in php-fpm