Add main-bosh-garden to docker build pipeline
Add main-bosh-garden to docker build pipeline

[#146710227](https://www.pivotaltracker.com/story/show/146710227)

Signed-off-by: Dennis Leon <84f467a5e250ceeacb4292b28bf3ac3f822ea696@pivotal.io>

barthy1/bosh,barthy1/bosh,barthy1/bosh,barthy1/bosh