ftp.postgresql.org/pub/repos/yum/13/redhat/rhel-8-x86_64 :
postgis30_13-3.0.3-8.rhel8.x86_64.rpm
postgis30_13-client-3.0.3-8.rhel8.x86_64.rpm
postgis30_13-docs-3.0.3-8.rhel8.x86_64.rpm
postgis30_13-gui-3.0.3-8.rhel8.x86_64.rpm
postgis30_13-utils-3.0.3-8.rhel8.x86_64.rpm
postgis31_13-3.1.1-4.rhel8.x86_64.rpm
postgis31_13-client-3.1.1-4.rhel8.x86_64.rpm
postgis31_13-docs-3.1.1-4.rhel8.x86_64.rpm
postgis31_13-gui-3.1.1-4.rhel8.x86_64.rpm
postgis31_13-utils-3.1.1-4.rhel8.x86_64.rpm