postgresql-extension

env vars:

-e POSTGRESQL_USER=coffeeshopadmin
-e POSTGRESQL_DATABASE=coffeeshopdb
-e POSTGRESQL_PASSWORD=redhat21
-e POSTGRESQL_ADMIN_PASSWORD=postgres

Build and push using tekton

oc create -f tekton/source-pvc.yml
oc apply -f tekton/s2i-task.yml
oc apply -f tekton/postgresql-pipeline.yml