I made a model of a big sphere with a NASA star field. Here is the code and I'll include a link to the texture:
//Loading
stars := rl.LoadModel("assets/Skybox.glb")
// Rendering
rl.DrawModel(stars,camera.position, 10, rl.WHITE)
I make the sphere follow the camera and would've made it a lot bigger if you were free to fly around.
Texture is from https://svs.gsfc.nasa.gov/4856/. I loaded it into blender and made the glb file from there. You should be able to load it from the game download.