internal/rosa: lazy initialise all artifacts

This improves performance, though not as drastically as lazy initialising llvm.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/ninja.go

@@ -2,15 +2,14 @@ package rosa
 
 import "hakurei.app/internal/pkg"
 
-// NewNinja returns a [pkg.Artifact] containing an installation of Ninja.
-func (t Toolchain) NewNinja() pkg.Artifact {
+func (t Toolchain) newNinja() pkg.Artifact {
 	const (
 		version  = "1.13.2"
 		checksum = "ygKWMa0YV2lWKiFro5hnL-vcKbc_-RACZuPu0Io8qDvgQlZ0dxv7hPNSFkt4214v"
 	)
 	return t.New("ninja-"+version, []pkg.Artifact{
-		t.NewCMake(),
-		t.NewPython(),
+		t.Load(CMake),
+		t.Load(Python),
 	}, nil, nil, `
 chmod -R +w /usr/src/ninja/
 mkdir -p /work/system/bin/ && cd /work/system/bin/
@@ -33,3 +32,4 @@ python3 /usr/src/ninja/configure.py \
 			pkg.TarGzip,
 		)))
 }
+func init() { artifactsF[Ninja] = Toolchain.newNinja }