gitea: add PAM support

pkgs/applications/version-management/gitea/default.nix

@@ -1,6 +1,7 @@
 { stdenv, buildGoPackage, fetchFromGitHub, makeWrapper
-, git, bash, gzip, openssh
+, git, bash, gzip, openssh, pam
 , sqliteSupport ? true
+, pamSupport ? true
 }:
 
 with stdenv.lib;
@@ -31,9 +32,11 @@ buildGoPackage rec {
     substituteInPlace modules/setting/setting.go --subst-var data
   '';
 
-  nativeBuildInputs = [ makeWrapper ];
+  nativeBuildInputs = [ makeWrapper ]
+    ++ optional pamSupport pam;
 
-  buildFlags = optional sqliteSupport "-tags sqlite";
+  buildFlags = optional sqliteSupport "-tags sqlite"
+    ++ optional pamSupport "-tags pam";
   buildFlagsArray = ''
     -ldflags=
       -X=main.Version=${version}