Install GCC

Author: marvinfriede

.github/workflows/test.yml

@@ -66,6 +66,11 @@ jobs:
           ln -s /usr/local/bin/gcc-${{ env.GCC_V }} /usr/local/bin/gcc
           ln -s /usr/local/bin/g++-${{ env.GCC_V }} /usr/local/bin/g++
 
+      - name: Install GCC (Linux)
+        - run:   |
+          sudo apt update
+          sudo apt install gcc-${{ env.GCC_V }} g++-${{ env.GCC_V }} gfortran-${{ env.GCC_V }}
+
       - name: Install GCC (Linux)
         if: contains(matrix.os, 'ubuntu')
         run: >-