Add test-docker-boshrelease-pr task
Add test-docker-boshrelease-pr task

[#154767498]

Signed-off-by: Greg Patricio <6d217c5209b4dedf4fa631a323e028cc07b9dbca@pivotal.io>

cloudfoundry-community/docker-boshrelease,cf-platform-eng/docker-boshrelease,cf-platform-eng/docker-boshrelease,cloudfoundry-community/docker-boshrelease