Skip docs job in nightly runs (#1215)

This PR configures the branch workflow to skip the docs job during nightly runs.

Authors:
  - Jake Awe (https://github.com/AyodeAwe)

Approvers:
  - AJ Schmidt (https://github.com/ajschmidt8)

URL: #1215

.github/workflows/build.yaml

@@ -53,7 +53,7 @@ jobs:
       date: ${{ inputs.date }}
       sha: ${{ inputs.sha }}
   docs-build:
-    if: ${{ startsWith(github.ref, 'refs/heads/branch-') }}
+    if: github.ref_type == 'branch' && github.event_name == 'push'
     needs: python-build
     secrets: inherit
     uses: rapidsai/shared-action-workflows/.github/workflows/[email protected]