Add K8s operators for PGSQL

[CC-Hsu]

Hi, Team,

I notice that this list include Docker images.

It may also be useful to include K8s operators running PGSQL clusters.

I know below lists so far (listed in alphabetic order):

• Crunchy PostgreSQL For Kubernetes
• EDB Cloud Native Postgresql
• Fujitsu Enterprise Postgres Operator
• KubeGres
• StackGres
• stolon postgres operator
• zalando postgres-operator

Maybe you can consider to include this topic. 😊

Best Regards.

[takeda]

Yes, the list is outdated and lists things that are no longer alive for many years, for example Postgres-XL, link even doesn't work anymore and seems like last activity was 7 years ago.

Kubernetes operators are definitively something that's currently hot and should be covered as likely a lot of people would be looking for these.

Also I think the list needs some heavy trimming, some things are outdated, but some I don't even know how relevant they are. For example pglogical is updated, but probably less relevant since PG now has built in logical replication.

[orthlus]

also maybe https://github.com/cloudnative-pg/cloudnative-pg

[kmoppel]

Added a new Kubernetes section plus hopefully all the more popular projects