Problem:

pulp_installer CI always updates the container to CentOS Stream

Solution: Fix the line that was only supposed to install epel-release
but also instaleld stream, and cleanup the original workaround
to ugprade to Stream if on 8.1.

fixes: #7456

CHANGES/7456.dev

@@ -0,0 +1,2 @@
+Molecule & pulp_installer CI no longer update the CentOS 8 container to CentOS Stream.
+(They were doing it always, since 8.2 released by accident.)

molecule/scenario_resources/Dockerfile.j2

@@ -60,11 +60,8 @@ systemctl enable firewalld
 {% else -%}
 # fedora or centos-8
 
-# Pulp requires CentOS 8.2 or later. 8.2 is currently CentOS Stream.
-RUN grep -v "CentOS" /etc/redhat-release || dnf install -y centos-release-stream epel-release &&\
+RUN grep -v "CentOS" /etc/redhat-release || dnf install -y epel-release &&\
 dnf makecache &&\
-grep -v "CentOS Linux release 8.1." /etc/redhat-release || dnf update -y &&\
-grep -v "CentOS Linux release 8.1." /etc/redhat-release || dnf install -y centos-release-stream &&\
 dnf update -y &&\
 dnf --assumeyes install \
   bash \