[docs] [issue37860] Add deploy preview for docs

Batuhan Taskaya batuhanosmantaskaya@gmail.com added the comment:

Personally, I feel that it most largely benefits more significant documentation changes that involve modification of existing markup or the addition of new markup, rather than all documentation PRs. So a manually added label to trigger it makes the most sense to me. This would be very similar to the recently added "test-with-buildbots" label.

+1, It would be so much useful in cases like GH 19928.

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