gitlab-ci: add build stage
Mostly copy build steps from meta-guf-distro's gitlab-ci files. Also use templated build stage in separate file .gitlab-ci-build.yml.
Change-Id: I59dfd1eaae3244881d8a00bf384c03518079ce25
Mostly copy build steps from meta-guf-distro's gitlab-ci files. Also use templated build stage in separate file .gitlab-ci-build.yml.
Change-Id: I59dfd1eaae3244881d8a00bf384c03518079ce25