Check for RHEL a different way

Author: bsquizz

Dockerfile

@@ -14,7 +14,7 @@ WORKDIR $APP_ROOT
 
 # install postgresql from centos if not building on RHEL host
 RUN ON_RHEL=$(microdnf repolist --enabled | grep rhel) ; \
-    if [[ ! -f /activation-key && -z "$ON_RHEL" ]] ; then \
+    if [[ -z "$ON_RHEL" ]] ; then \
         rpm -Uvh http://mirror.stream.centos.org/9-stream/BaseOS/x86_64/os/Packages/centos-stream-repos-9.0-35.el9.noarch.rpm \
                  http://mirror.stream.centos.org/9-stream/BaseOS/x86_64/os/Packages/centos-gpg-keys-9.0-35.el9.noarch.rpm && \
         sed -i 's/^\(enabled.*\)/\1\npriority=200/;' /etc/yum.repos.d/centos*.repo ; \