ci: add gfortran-11

Author: gnikit

.github/workflows/main.yaml

@@ -5,15 +5,34 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
+        gcc_v: [11]
         node-version: [18.x]
       fail-fast: false
     runs-on: ${{ matrix.os }}
+    env:
+      FC: gfortran-${{ matrix.gcc_v }}
+      CC: gcc-${{ matrix.gcc_v }}
+      CXX: g++-${{ matrix.gcc_v }}
+      GCC_V: ${{ matrix.gcc_v }}
+
     steps:
       - uses: actions/checkout@v3
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node-version }}
+
+      - name: Install GCC compilers Linux
+        if: contains( matrix.os, 'ubuntu')
+        run: |
+          sudo add-apt-repository ppa:ubuntu-toolchain-r/test
+          sudo apt-get update
+          sudo apt-get install -y gcc-${GCC_V} g++-${GCC_V} gfortran-${GCC_V}
+          sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-${GCC_V} 100 \
+          --slave /usr/bin/gfortran gfortran /usr/bin/gfortran-${GCC_V} \
+          --slave /usr/bin/g++ g++ /usr/bin/g++-${GCC_V} \
+          --slave /usr/bin/gcov gcov /usr/bin/gcov-${GCC_V}
+
       - name: Installing Extension
         run: npm ci
       - name: Compile