Intermittent docker image build errors

[ryansanford]

Error always has to do with key server access related to installation of gosu.

Error

gpg: requesting key BF357DD4 from hkp server ha.pool.sks-keyservers.net

�[0m�[91mgpg: keyserver timed out

gpg: keyserver receive failed: keyserver error

�[0m�[31mERROR�[0m: Service 'uwsgi' failed to build: The command '/bin/sh -c gpg --keyserver ha.pool.sks-keyservers.net --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4' returned a non-zero code: 2