trying to link GLPK to quash some warnings

Author: pavelkomarov

.github/workflows/test.yml

@@ -17,6 +17,7 @@ jobs:
       - name: tests and coverage
         run: | # top line is for building cvxopt from source, which is recently necessary for Python 3.14, too new for prebuilt wheel
           sudo apt-get install -y libblas-dev liblapack-dev libsuitesparse-dev libglpk-dev
+          export CVXOPT_GLPK=True CVXOPT_GLPK_INC=/usr/include CVXOPT_GLPK_LIB=/usr/lib/x86_64-linux-gnu
           pip install -e .[advanced,dev] coveralls
           coverage run --source=pynumdiff --omit='pynumdiff/_version.py,pynumdiff/tests/*,pynumdiff/utils/old_pi_cruise_control.py' -m pytest -s
           coverage xml