RHINENG-10462: install postgresql from copr

Dockerfile

@@ -5,12 +5,10 @@ FROM ${BUILDIMG} as buildimg
 ARG INSTALL_TOOLS=no
 
 # install build, development and test environment
-RUN rpm -Uvh http://mirror.centos.org/centos/8-stream/BaseOS/x86_64/os/Packages/centos-stream-repos-8-4.el8.noarch.rpm \
-        http://mirror.centos.org/centos/8-stream/BaseOS/x86_64/os/Packages/centos-gpg-keys-8-4.el8.noarch.rpm && \
-    sed -i 's/^\(enabled.*\)/\1\npriority=200/;' /etc/yum.repos.d/CentOS*.repo
+RUN dnf module enable -y postgresql:16 || curl -o /etc/yum.repos.d/postgresql.repo \
+        https://copr.fedorainfracloud.org/coprs/mmraka/postgresql-16/repo/epel-8/mmraka-postgresql-16-epel-8.repo
 
-RUN dnf module -y enable postgresql:16 && \
-    dnf install -y go-toolset postgresql diffutils rpm-devel && \
+RUN dnf install -y go-toolset postgresql diffutils rpm-devel && \
     ln -s /usr/libexec/platform-python /usr/bin/python3
 
 ENV GOPATH=/go \