To be executed after running the packaging script.

1. CMake configure Krita + build
2. Run packaging script
3. In an empty directory, do the following:

cmake -DREMOVE_DEBUG=ON -DOUTPUT_FILEPATH="%cd%\krita-setup-test.exe"-DKRITA_PACKAGE_ROOT="absolute_path_to_krita_package_output_directory" -P path_to_install_directory\MakeinstallerNsis.cmake

Set REMOVE_DEBUG to ON deletes the debug symbols so they won't be included in the installer.
The script downloads its copy of NSIS.

On the binary factory it probably means adding this after running the packaging script:

mkdir installer
pushd installer
cmake -DREMOVE_DEBUG=ON -DOUTPUT_FILEPATH="%cd%\krita-%version_string%-x64-setup.exe"-DKRITA_PACKAGE_ROOT="%cd%\..\krita-%version_string%-x64" -P C:\Packaging\KritaWS\krita-install\MakeinstallerNsis.cmake
if errorlevel 1 exit /b 1
signtool sign %SIGNTOOL_SIGN_FLAGS% krita-%version_string%-x64-setup.exe
if errorlevel 1 exit /b 1
popd

assuming the package name is "krita-%version_string%-x64" where "%version_string%" is replaced with the release version number and "x64" is replaced to "x86" the 32-bit build.

(You can test it with the nightly build, but if you do please add "DO-NOT-USE" to the output installer filename and rename the file extension to something that is not ".exe", e.g. ".dat")

If this looks fine, I'll commit it and let @bcooksley test on the binary factory later.