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This allows multiple build flavors for a single codebase, without sacrificing reproducible builds. The build-args are set in build.yml, which is typically under the source control (if it is not, then no reproducible builds are possible anyways). Meaning that mutating build-args would result in setting "dirty" flag. Intended use of this commit is to switch between build flavors by specifying a different yaml file (presumably also under the version control) by `-build-yml` option. Because it is impossible to build a final image from packages in cache, the test for this feature relies on the `RUN echo $build-arg` output during the `pkg build` process. Signed-off-by: Yuri Volchkov <yuri@zededa.com>