Skip docs deploy on tag CI runs (#3232)

Tag CI runs build-docs.yml with is-release: true and the default
component: all, which previously deployed every subproject's
versioned docs to gh-pages. On any tag push, the subprojects that
happen to be on a .dev wheel at that moment leak truncated
clean-looking X.Y.Z trees onto gh-pages (build_docs.sh strips the
.dev suffix for cuda-bindings and cuda-pathfinder; cuda-core
preserves it).

release.yml already handles the component-scoped release deploy;
tag CI only needs to validate the build.

Refs #3231. Addresses review on #3232.

Author: leofang

.github/workflows/ci.yml

@@ -631,6 +631,7 @@ jobs:
     uses: ./.github/workflows/build-docs.yml
     with:
       is-release: ${{ github.ref_type == 'tag' }}
+      deploy-docs: ${{ github.ref_type != 'tag' }}
 
   checks:
     name: Check job status