Matt McEuen 958d783919 Add site doc validation gate
This adds a gate which loops over all phases in all sites,
and performs an airshipctl apply --dry-run on them to ensure YAML
validity and schema adherence.  Aside from installation tasks,
the gate is run via a makefile entrypoint so that it can be
easily consumed by developers or by non-zuul CICD platforms.

Change-Id: Ie4ab246848a580ab20c3153af1e3749a27e3f770
2020-06-04 18:04:47 -05:00
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