Install OpenBLAS in Python CI. (#74)

Author: teo-tsirpanis

.github/workflows/ci_python.yml

@@ -14,6 +14,8 @@ jobs:
         python-version: ["3.9"]
     runs-on: ${{ matrix.os }}
     steps:
+      - name: Install OpenBLAS
+        run: sudo apt install libopenblas-dev
       - uses: actions/checkout@v3
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2