[w3c/push-api] Add support for pr-preview (#268)

See https://github.com/tobie/pr-preview#pr-preview for more details.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/push-api/pull/268

-- Commit Summary --

  * Add support for pr-preview

-- File Changes --

    A .pr-preview.json (4)

-- Patch Links --

https://github.com/w3c/push-api/pull/268.patch
https://github.com/w3c/push-api/pull/268.diff

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https://github.com/w3c/push-api/pull/268