Don't need to remove the alternatives for gcc in github actions before installing. Also changing the if to not check string but rather if it was defined to skip install step

Author: LinuxDevon

.github/workflows/pipeline.yml

@@ -30,17 +30,15 @@ jobs:
     - uses: actions/checkout@v4
 
     - name: Install clang
-      if: ${{ matrix.llvm_version }} != ""
+      if: ${{ matrix.llvm_version }}
       run: |
         wget https://apt.llvm.org/llvm.sh
         chmod +x llvm.sh
         sudo ./llvm.sh ${{ matrix.llvm_version }}
 
     - name: Install gcc
-      if: ${{ matrix.gcc_version }} != ""
+      if: ${{ matrix.gcc_version }}
       run: |
-        update-alternatives --remove-all gcc
-        update-alternatives --remove-all g++
         add-apt-repository ppa:ubuntu-toolchain-r/test
         apt-get update
         apt-get install -y ${{ matrix.gcc_version }}