always run sphinx-build in sphinx.yml

we need to build docs in order to publish or archive them as artifacts

.github/workflows/sphinx.yml

@@ -21,7 +21,6 @@ jobs:
         run: pip install sphinx-immaterial -e .
 
       - name: Build docs
-        if: github.ref != 'refs/heads/main'
         run: sphinx-build docs ${{ inputs.path-to-doc }}
 
       - name: Upload docs build as artifact