Specify proper build path for Docker image
Specify proper build path for Docker image

The Docker image must be built from the golang-release directory because
it adds itself and an entrypoint script to the image.

[#180054765] TAS-138 Add Golang autobumping and dependency autobumping to our Go repos

Signed-off-by: Brian Upton <633483f7295e665b4a23d10cfc31c2458b36dfcc@vmware.com>

bosh-packages/golang-release,bosh-packages/golang-release