CI: move apt install to ubuntu.yml

.ci/ubuntu_install.sh

@@ -1,3 +0,0 @@
-#!/bin/bash
-apt-get update -qq
-apt-get install cmake git gcc g++ make ninja-build -qq

.github/workflows/ubuntu.yml

@@ -17,7 +17,7 @@ jobs:
       with: 
         submodules: recursive
     - name: Install packages
-      run: sudo .ci/ubuntu_install.sh
+      run: sudo apt-get update -qq && sudo apt-get install cmake git gcc g++ make ninja-build -qq
     - name: Configure CMake
       run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -GNinja
     - name: Build