headscale: backport trim of oidc secret path

This is a backport of https://github.com/juanfont/headscale/pull/1697
which trims the oidc client_secret_path.

pkgs/servers/headscale/default.nix

@@ -18,6 +18,11 @@ buildGoModule rec {
 
   vendorHash = "sha256-IOkbbFtE6+tNKnglE/8ZuNxhPSnloqM2sLgTvagMmnc=";
 
+  patches = [
+    # backport of https://github.com/juanfont/headscale/pull/1697
+    ./trim-oidc-secret-path.patch
+  ];
+
   ldflags = ["-s" "-w" "-X github.com/juanfont/headscale/cmd/headscale/cli.Version=v${version}"];
 
   nativeBuildInputs = [installShellFiles];

pkgs/servers/headscale/trim-oidc-secret-path.patch

@@ -0,0 +1,13 @@
+diff --git a/hscontrol/config.go b/hscontrol/config.go
+index 0e83a1c..71fbfb0 100644
+--- a/hscontrol/config.go
++++ b/hscontrol/config.go
+@@ -573,7 +573,7 @@ func GetHeadscaleConfig() (*Config, error) {
+ 		if err != nil {
+ 			return nil, err
+ 		}
+-		oidcClientSecret = string(secretBytes)
++		oidcClientSecret = strings.TrimSpace(string(secretBytes))
+ 	}
+ 
+ 	return &Config{