internal/rosa/go: migrate to generic helper

The go toolchain predates all abstractions currently available. This migration causes rebuilds due to internal cleanups affecting the final build script.

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

internal/rosa/hakurei.go

@@ -18,7 +18,8 @@ go build -o /bin/hostname /usr/src/hostname/main.go
 	return t.NewPackage(name, hakureiVersion, t.NewPatchedSource(
 		"hakurei-"+hakureiVersion, hakureiSource, false, hakureiPatches...,
 	), &PackageAttr{
-		Writable: true,
+		EnterSource: true,
+		Writable:    true,
 		Env: []string{
 			"CGO_ENABLED=1",
 			"GOCACHE=/tmp/gocache",
@@ -42,6 +43,7 @@ func main() {
 `),
 		))},
 	}, &GenericHelper{
+		InPlace: true,
 		Build: hostname + `
 HAKUREI_VERSION='v` + hakureiVersion + `'
 ` + build,