Merge pull request #160 from developmentseed/fix/docs-postgres-operator

Document choice of postgres operator

Author: j08lue

docs/postgres-operator.md

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+Q: eoapi-k8s uses the postgres-operator from crunchydata. Is there a reason why you have chosen this solution? There is also a postgres-operator from Zalando. What are the benefits using an operator instead of a postgres helm chart?
+
+A: We made the choice to use Crunchydata's operator over Zalando's operator and cloudnative-pg's operator (they all install operators even if using the helm install option) after considering the following things:
+
+1. quality of the documentation
+2. backlog of issues
+3. knowing that a lot of core PG contributors work at Crunchydata and hearing about some of the cutting edge things they are doing
+4. talking with other folks in our community
+
+That said, what we want out of an operator "most" of the above options share:
+
+1. backups
+2. some kind of connection pooling option set up for us
+3. good solid docs and choices about how upgrades work
+
+See also https://github.com/developmentseed/eoapi-k8s/issues/132