increase pg_data volume on production

[nllong]

[nllong]

already completed on staging.

Followed these instructions on staging:

https://kubernetes.io/blog/2018/07/12/resizing-persistent-volumes-using-kubernetes/

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[RDmitchell]

Seems like we still need to do this?

[nllong]

yeah, we still need this one. It isn't hard, just need to find the time.

[nllong]

nvm. I just finished this... volume was doubled.