Install gfortran

Author: termoshtt

.github/workflows/openblas.yml

@@ -20,6 +20,10 @@ jobs:
           - system
     steps:
       - uses: actions/checkout@v1
+      - name: apt install gfortran
+        run: |
+          apt update
+          apt install -y gfortran
       - name: Install OpenBLAS by apt
         run: |
           apt update