Redis and Postgres not working on OKD 4.6

We are using OKD 4.6, but it is impossible to use this template Airflow because Redis and Postgres are crashing directly

* Postgresql is in a `CrashLoopBackOff` with those logs (wow we got logs this time! Thanks OpenShift)
```
pg_ctl: another server might be running; trying to start server anyway
waiting for server to start....2021-08-24 11:51:54.167 UTC [25] LOG: starting PostgreSQL 12.5 on x86_64-redhat-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-44), 64-bit
2021-08-24 11:51:54.168 UTC [25] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2021-08-24 11:51:54.171 UTC [25] LOG: listening on Unix socket "/tmp/.s.PGSQL.5432"
2021-08-24 11:51:54.199 UTC [25] LOG: redirecting log output to logging collector process
2021-08-24 11:51:54.199 UTC [25] HINT: Future log output will appear in directory "log".
............ done
server started
/var/run/postgresql:5432 - accepting connections
=> sourcing /usr/share/container-scripts/postgresql/start/set_passwords.sh ...
ERROR: role "userLHV5S" does not exist
```

* Redis is just "Scaling up" without showing any single event nor logs (the usual OpenShift mess where a deployment just don't want to start, but OpenShift is not reporting anything anywhere)

* Note that I am also having this problem: https://github.com/CSCfi/airflow-openshift/issues/10 when starting new-app from the terminal with `oc new-app`

Normally Redis and Postgres are fairly regular services to deploy on OpenShift (it exists number of operators/template)

Would it be possible to reuse an existing working deployments for those 2 commons databases? Instead of rewriting the whole deployment from scratch in the template

Another option would be to start Airflow using the official Helm chart here: https://github.com/airflow-helm/charts/tree/main/charts/airflow

Anyone got experience on which configuration needs to be added to this chart to make it work on OpenShift?