internal/pkg: loadavg target in container environment

This exposes preferred loadavg target to the container initial process.

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

internal/pkg/internal/testtool/main.go

@@ -38,7 +38,15 @@ func main() {
 	}
 
 	environ := slices.DeleteFunc(slices.Clone(os.Environ()), func(s string) bool {
-		return s == "CURE_JOBS="+strconv.Itoa(runtime.NumCPU())
+		for _, t := range []string{
+			"CURE_JOBS=" + strconv.Itoa(runtime.NumCPU()),
+			"CURE_LOAD=" + strconv.Itoa(runtime.NumCPU()+2),
+		} {
+			if s == t {
+				return true
+			}
+		}
+		return false
 	})
 
 	var hostNet, layers, promote bool