ci: use self-hosted runner for Linux builds

- Remove package installation step (already available)
- Fix package conflict errors on self-hosted runner

Signed-off-by: NotKeira <github.rxs06@accounts.keira.boo>

Author: NotKeira

.github/workflows/ci.yaml

@@ -44,11 +44,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Install Compilers
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y ${{ matrix.compiler.cxx }}
-
       - name: Configure CMake
         env:
           CC: ${{ matrix.compiler.cc }}