ci: remove ninja test

getting spurious timeouts on download that are CI-specific

.github/workflows/ci.yml

@@ -22,43 +22,37 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - name: Install Ninja
-      run: cmake -Dprefix:PATH=~/ninja -P scripts/install_ninja.cmake
-
     - name: Install CMake
       run: cmake -Dprefix:PATH=~/cmake -P scripts/install_cmake.cmake
 
     - name: CMake path (linux)
       if: runner.os == 'Linux'
       run: |
         echo "$HOME/cmake/bin" >> $GITHUB_PATH
-        echo "CMAKE_PROGRAM_PATH=$HOME/ninja" >> $GITHUB_ENV
 
     - name: CMake path (macOS)
       if: runner.os == 'macOS'
       run: |
         echo "$HOME/cmake/CMake.app/Contents/bin" >> $GITHUB_PATH
-        echo "CMAKE_PROGRAM_PATH=$HOME/ninja" >> $GITHUB_ENV
 
     - name: CMake path (Windows)
       if: runner.os == 'Windows'
       run: |
         echo "$env:userprofile/cmake/bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
-        echo "CMAKE_PROGRAM_PATH=$env:userprofile/ninja" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
 
     - run: echo $PATH
 
     - run: cmake --version
 
     - name: configure cmake (w/ Fortran)
       if: runner.os != 'Windows'
-      run: cmake -G Ninja --preset default
+      run: cmake --preset default
       env:
         FC: gfortran-14
 
     - name: configure CMake (w/o Fortran)
       if: runner.os == 'Windows'
-      run: cmake -G Ninja -Dfortran=no --preset default
+      run: cmake -Dfortran=no --preset default
 
     - run: cmake --build --preset release