Update sync_docs.yaml (#175)

A [new `sync_docs.yaml`
workflow](canonical/data-platform-workflows#220)
was released in data-platform-workflows `v19.2.0`. It overwrites the old
experimental `_sync_docs.yaml` workflow and releases it to the public
interface.

This PR:
* Corrects the filename to match the new syntax without the experimental
`_` prefix.
* Removes the now unnecessary Discourse API credentials
* Adds automatic reviewers

.github/workflows/sync_docs.yaml

@@ -5,15 +5,14 @@ name: Sync docs from Discourse
 on:
   workflow_dispatch:
   schedule:
-    - cron: 40 00 * * *
+    - cron: '53 0 * * *'    # Daily at 00:53 UTC
 
 jobs:
   sync-docs:
     name: Sync docs from Discourse
-    uses: canonical/data-platform-workflows/.github/workflows/[email protected]
-    secrets:
-      discourse-api-user: ${{ secrets.DISCOURSE_API_USERNAME }}
-      discourse-api-key: ${{ secrets.DISCOURSE_API_KEY }}
+    uses: canonical/data-platform-workflows/.github/workflows/[email protected]
+    with:
+      reviewers: a-velasco
     permissions:
       contents: write  # Needed to push branch & tag
       pull-requests: write  # Needed to create PR