Keep pull request builds deployment-free

Signed-off-by: Bradley Dice <bdice@bradleydice.com>

Author: bdice

.github/workflows/deploy.yaml

@@ -6,7 +6,6 @@ on:
   push:
     branches:
       - main
-      - "pull-request/[0-9]+"
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true

CONTRIBUTING.md

@@ -60,8 +60,9 @@ make serve
 
 Submit changes as a pull request to `rapidsai/docs`. The RAPIDS copy-PR bot
 copies the pull request head to a `pull-request/<number>` branch in the upstream
-repository. CI validates that branch, assembles the complete documentation
-site, and creates a non-production Netlify preview for review.
+repository. CI validates that branch and dry-runs assembly of the complete
+S3-backed documentation site without deploying it. Netlify's repository
+integration separately creates a portal-only preview for review.
 
 ## Developer Certificate of Origin
 

README.md

@@ -40,9 +40,9 @@ validation.
 
 Pull requests opened against `rapidsai/docs` are copied to a
 `pull-request/<number>` branch by the RAPIDS copy-PR bot. That branch runs the
-same validation, assembles the complete documentation tree, and creates a
-non-production Netlify preview. Merges to `main` continue to deploy the
-production site.
+same validation and dry-runs assembly of the complete S3-backed documentation
+tree without deploying it. Netlify's repository integration separately creates
+a portal-only preview. Merges to `main` continue to deploy the production site.
 
 ## Repository layout