lib.licenses: add DRL-1.0

https://spdx.org/licenses/DRL-1.0.html
https://github.com/SigmaHQ/sigma/blob/master/LICENSE.Detection.Rules.md

lib/licenses.nix

@@ -285,6 +285,11 @@ in mkLicense lset) ({
     fullName = "DOC License";
   };
 
+  drl10 = {
+    spdxId = "DRL-1.0";
+    fullName = "Detection Rule License 1.0";
+  };
+
   eapl = {
     fullName = "EPSON AVASYS PUBLIC LICENSE";
     url = "https://avasys.jp/hp/menu000000700/hpg000000603.htm";