How to do update-alternatives --config without having an interactive prompt?

So I'm trying to run these commands in the Github Actions environment:

sudo update-alternatives --config x86_64-w64-mingw32-gcc

sudo update-alternatives --config x86_64-w64-mingw32-g++

to change the threading model to POSIX, but it brings up the following prompt:

There are 2 choices for the alternative x86_64-w64-mingw32-gcc (providing /usr/bin/x86_64-w64-mingw32-gcc).  Selection    Path                                   Priority   Status------------------------------------------------------------* 0            /usr/bin/x86_64-w64-mingw32-gcc-win32   60        auto mode  1            /usr/bin/x86_64-w64-mingw32-gcc-posix   30        manual mode  2            /usr/bin/x86_64-w64-mingw32-gcc-win32   60        manual mode

How do I answer this without having access to the shell? I have tried giving 1 as a command (didn't work), and these:

echo "1" > sudo update-alternatives --config x86_64-w64-mingw32-gcc

echo "1" > sudo update-alternatives --config x86_64-w64-mingw32-g++

But after I use sudo update-alternatives --config x86_64-w64-mingw32-gcc and sudo update-alternatives --config x86_64-w64-mingw32-g++ to check, the prompt still shows the selection being at 0. (If you change the alternatives manually, it should remember your choice)

What do I do? Any help is appreciated.