Fixes issues with the config of our development database (#258)
Fixes issues with the config of our development database (#258)

* Use postgres 9.6-alpine in place of alpine-postgres.
We originally used alpine-postgres as it was lighter than postgres from the library.  However alpine-postgres is currently broken, and postgres 9.6-alpine is just as light.

This reverts commit e5f1413305af130d93064c37ac0a2775a03d23f5.

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