internal/rosa/hakurei: optionally use embedded source

This builds hakurei in Rosa OS between releases.

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

internal/rosa/hakurei_current.go

@@ -0,0 +1,26 @@
+//go:build current
+
+package rosa
+
+import (
+	_ "embed"
+
+	"hakurei.app/internal/pkg"
+)
+
+const hakureiVersion = "1.0-current"
+
+// hakureiSourceTarball is a compressed tarball of the hakurei source code.
+//
+//go:generate tar -zc -C ../.. --exclude .git --exclude *.tar.gz -f hakurei_current.tar.gz .
+//go:embed hakurei_current.tar.gz
+var hakureiSourceTarball []byte
+
+// hakureiSource is the source code at the time this package is compiled.
+var hakureiSource = pkg.NewTar(pkg.NewFile(
+	"hakurei-current.tar.gz",
+	hakureiSourceTarball,
+), pkg.TarGzip)
+
+// hakureiPatches are patches applied against the compile-time source tree.
+var hakureiPatches [][2]string