add install build in codecov workflow (gsl)

Author: Tieqiong

.github/workflows/codecov.yml

@@ -38,6 +38,7 @@ jobs:
         run: |
           conda install --file requirements/run.txt
           conda install --file requirements/test.txt
+          conda install --file requirements/build.txt
           python -m pip install -r requirements/pip.txt
           python -m pip install -e . --no-deps