👷 Add custom GitHub actions to preview docs

.github/actions/watch-previews/action.yml

@@ -0,0 +1,10 @@
+name: Watch docs previews in PRs
+description: Check PRs and trigger new docs deploys
+author: "Sebastián Ramírez <tiangolo@gmail.com>"
+inputs:
+  token:
+    description: 'Token for the repo. Can be passed in using {{ secrets.GITHUB_TOKEN }}'
+    required: true
+runs:
+  using: docker
+  image: Dockerfile