Release builder through expeditor

[mwrock]

When we do a builder release today, we need to choose a set of fully qualified builder packages to give to operations. I think what we want is for operations to be able to perform a /expeditor promote habitat rc which will automatically promote packages in the rc channel to stable.

This would involve the following:

• set up expeditor artifact channels. We want a unstable, rc and stable
• Once we validate that acceptance (which consumes unstable) we use the /expeditor promote slack command to promote to rc which should trigger a script to hab pkg promote the builder-api, builder-api-proxy, and builder-jobsrv packages at the head of unstable to rc
• Promoting from the rc channel should promoye to stable both in expeditor and builder.

This is similar (not identical) to the habitat release process.

[stale]

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