Change and push the gh-pages branch when rebuilding the spec.

Signed-off-by: Jeff Licquia <[email protected]>

.github/workflows/publish_v3.yml

@@ -36,5 +36,5 @@ jobs:
         run: git config user.name ci-bot; git config user.email [email protected]
         working-directory: spdx-spec
       - name: Build docs
-        run: mike deploy v3.0 v3-draft
+        run: mike deploy v3.0 v3-draft -b gh-pages -p
         working-directory: spdx-spec