xcaddy: fix build info

pkgs/servers/caddy/xcaddy/default.nix

@@ -14,9 +14,16 @@ buildGoModule rec {
   };
 
   patches = [
+    ./inject_version_info.diff
     ./use_tmpdir_on_darwin.diff
   ];
 
+  ldflags = [
+    "-s"
+    "-w"
+    "-X github.com/caddyserver/xcaddy/cmd.customVersion=v${version}"
+  ];
+
   vendorHash = "sha256-RpbnoXyTrqGOI7DpgkO+J47P17T4QCVvM1CfS6kRO9Y=";
 
   meta = with lib; {

pkgs/servers/caddy/xcaddy/inject_version_info.diff

@@ -0,0 +1,16 @@
+diff --git a/cmd/main.go b/cmd/main.go
+index ede7cd8..c553140 100644
+--- a/cmd/main.go
++++ b/cmd/main.go
+@@ -401,8 +401,11 @@ func splitWith(arg string) (module, version, replace string, err error) {
+ 	return
+ }
+
++var customVersion string
++
+ // xcaddyVersion returns a detailed version string, if available.
+ func xcaddyVersion() string {
++	return customVersion
+ 	mod := goModule()
+ 	ver := mod.Version
+ 	if mod.Sum != "" {