build-unit-test-docker: templatize build directives

Create 'pkg_build' function that generates the docker RUN template
necessary to build all the packages.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ie7e7a3b3e78c67e6d97a83f3b43c3c54d10b77e6
1 file changed