Add support for cmake/ninja --install

Hi,

I am currently using the action to build my project and everything works fine. However, my project does not only contain source files that need to be build, but rather uses install to put everything in place (e.g. raw files, artifacts, headers, etc.). It would be quite convenient, if run-cmake could be configured to automatically run ninja install or cmake --install after a successful build. For ninja, the install directory is stored in the CMakeSettings.json file. The action could treat it just as it does with the buildRoot directory (i.e. ignore and set to a default; maybe make it configurable).

Do you think this is possible?

Thanks and regards, Carsten.

[garyttierney]

FWIW, you can accomplish this using the run-cmake action by specifying the build target:

    - name: 'Build with CMake'
      uses: lukka/run-cmake@v3
      with:
        cmakeListsTxtPath: '${{ github.workspace }}/CMakeLists.txt'
        buildWithCMakeArgs: '--target install'

[lukka]

@Aschratt yes, it make sense to add a option similar to buildWithCMake, called installWithCMake, with default set to false. For the time being, the solution is to run cmake --install in a run step, assuming the cwd is the right one e.g.:

- name: Install with CMake
    run: cmake --install