Update build_check.yml

.github/workflows/build_check.yml

@@ -50,6 +50,7 @@ jobs:
         DISPLAY: test
     - name: Install Sphinx prereq
       run: |
+        conda install main::libarchive
         conda install -c conda-forge sphinx sphinx_rtd_theme nbconvert pandoc ipython ipython_genutils
     - name: Run the docs
       run: |