We use zalando's spilo image and its patroni operator for many years. Not only has the extensions, but everyhing configured and 'turn key solution' for both k8s and simple docker if you like. We compared many options which are listed in this thread and this came on top from both architecture, operability, popularity, etc. Works on both k8s and ocp. We also use pure patroni (non-docker) with vms, also a great

LATELLY, one may want to look at yugabyte and cockroachdb - they have wire compatibility with pg protocol. Depending on the way you use pg, it might be a much better choice for you. It's cloud native, have enterprise support, etc.