Add Linux stubs

truststore_linux.go

@@ -0,0 +1,16 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"log"
+	"path/filepath"
+)
+
+func (m *mkcert) installPlatform() {
+	log.Fatalf("-install is not yet supported on Linux 😣\nYou can manually install the root certificate at %q in the meantime.", filepath.Join(m.CAROOT, rootName))
+}
+
+func (m *mkcert) uninstallPlatform() {}