add pg_config as an alternative, so devel libs can be found

Containerfile.devel

@@ -4,4 +4,5 @@ RUN sed -i -e 's/\[base\]/[base]\nexclude=postgresql*/' -e 's/\[updates\]/[updat
   yum remove -y postgresql-* && \
   yum install -y https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm && \
    yum install -y postgresql13-devel && \
+   /usr/sbin/update-alternatives --install /usr/bin/pg_config pgsql-pg_config /usr/pgsql-13/bin/pg_config 1300 && \
    rm -rf /var/cache/* /var/log/yum.*