treewide: add license header and enable haslicense linter

Change-Id: I873a8d4082d75e8f813d8a726a41187eea7a065e
Reviewed-on: https://review.monogon.dev/c/monogon/+/3825
Tested-by: Jenkins CI
Reviewed-by: Leopold Schabel <leo@monogon.tech>
diff --git a/osbase/build/fwprune/main.go b/osbase/build/fwprune/main.go
index 0bedcfd..791c794 100644
--- a/osbase/build/fwprune/main.go
+++ b/osbase/build/fwprune/main.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 // fwprune is a buildsystem utility that filters linux-firmware repository
 // contents to include only files required by the built-in kernel modules,
 // that are specified in modules.builtin.modinfo.