deploy rules: Use extra execution group to obtain "bazel run" tool #187
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image_push, image_load, and multi_deploy all need to symlink an
imgtool that can run on the host.Previously, we used a transition that would change the target platform of the img toolchain. This is effectively a no-op, since any img toolchain can target any platform.
Now, we use a little trick to add an extra exec platform (the host platform) at the beginning of the list of available exec platforms for the img tool.
This should result in the right img tool (executable on the host) being selected.