Building testing pushing c8s support

[phracek]

This pull request adds support for building, and testing CentOS Stream 8 postgresql-container.
It also adds support for pushing images into quay.io/sclorg repositories.

What is the difference between 13/Dockerfile.rhel8 and 13/Dockerfile.c8s:

$ diff 13/Dockerfile.rhel8 13/Dockerfile.c8s
1c1
< FROM ubi8/s2i-core
---
> FROM quay.io/sclorg/s2i-core-c8s:c8s
13a14
>     POSTGRESQL_PREV_VERSION=12 \
30c31
<       name="rhel8/postgresql-13" \
---
>       name="sclorg/postgresql-13-c8s" \
33,34c34
<       com.redhat.license_terms="https://www.redhat.com/en/about/red-hat-end-user-license-agreements#rhel" \
<       usage="podman run -d --name postgresql_database -e POSTGRESQL_USER=user -e POSTGRESQL_PASSWORD=pass -e POSTGRESQL_DATABASE=db -p 5432:5432 rhel8/postgresql-13" \
---
>       usage="podman run -d --name postgresql_database -e POSTGRESQL_USER=user -e POSTGRESQL_PASSWORD=pass -e POSTGRESQL_DATABASE=db -p 5432:5432 sclorg/postgresql-13-c8s" \
49c49

What is the difference between 10/Dockerfile.rhel8 and 10/Dockerfile.c8s:

$ diff 10/Dockerfile.rhel8 10/Dockerfile.c8s
1c1
< FROM ubi8/s2i-core
---
> FROM quay.io/sclorg/s2i-core-c8s:c8s
31c31
<       name="rhel8/postgresql-10" \
---
>       name="sclorg/postgresql-10-c8s" \
34,35c34
<       com.redhat.license_terms="https://www.redhat.com/en/about/red-hat-end-user-license-agreements#rhel" \
<       usage="podman run -d --name postgresql_database -e POSTGRESQL_USER=user -e POSTGRESQL_PASSWORD=pass -e POSTGRESQL_DATABASE=db -p 5432:5432 rhel8/postgresql-10" \
---
>       usage="podman run -d --name postgresql_database -e POSTGRESQL_USER=user -e POSTGRESQL_PASSWORD=pass -e POSTGRESQL_DATABASE=db -p 5432:5432 sclorg/postgresql-10-c8s" \
49c48

[phracek]

[test-all]

[fila43]

It makes sense to me and tests passed LGTM