internal/rosa/package: migrate stage0

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

internal/rosa/package/stage0.az

@@ -1,5 +1,31 @@
-package stage0-dist {
+package rosa-stage0 {
 	description = "Rosa OS stage0 bootstrap seed";
+	version = unversioned;
+	exclude = true;
+
+	source = hakurei-source;
+	extra = [
+		llvm,
+		mksh,
+		toybox-early,
+	];
+	overlay = "/stage0";
+	exec = generic {
+		build = `
+umask 377
+tar \
+	-vjc \
+	-C /stage0 \
+	-f /work/stage0-`+triple+`.tar.bz2 \
+	.
+`;
+	};
+
+	inputs = [ bzip2 ];
+}
+
+package stage0-dist {
+	description = "Rosa OS stage0 bootstrap seed (binary distribution)";
 	exclude = true;
 
 	version* = "20260504";