bosh-init command to compile CPIs

[drnic]

I want to package the bosh-init CLI plus a pre-compiled CPI into docker images.

Progress:

• [x] https://github.com/drnic/concourse-tutorial/blob/master/60_multi_jobs_bosh_micro_build/templates/pipeline-repackage.yml
• [x] https://gist.github.com/drnic/db1126b8456bcaa854f3

I need a way to compile the CPI in the gist above; so it can then be bundled into the Dockerfile.

Currently I think the only path is to try to bosh-init deploy and pass in stemcells AND manifest.

Could we have a dedicated command that just does the CPI compilation please?

/cc @cppforlife