starship: expose config-schema.json via passthru.jsonschema (#548639)

pkgs/by-name/st/starship/package.nix

@@ -34,6 +34,7 @@ rustPlatform.buildRustPackage (finalAttrs: {
     presetdir=$out/share/starship/presets/
     mkdir -p $presetdir
     cp docs/public/presets/toml/*.toml $presetdir
+    install -Dm644 .github/config-schema.json $out/share/starship/config-schema.json
   ''
   + lib.optionalString (stdenv.hostPlatform.emulatorAvailable buildPackages) (
     let
@@ -55,8 +56,13 @@ rustPlatform.buildRustPackage (finalAttrs: {
     writableTmpDirAsHomeHook
   ];
 
-  passthru.tests = {
-    inherit (nixosTests) starship;
+  passthru = {
+    jsonschema = {
+      config = "${finalAttrs.finalPackage}/share/starship/config-schema.json";
+    };
+    tests = {
+      inherit (nixosTests) starship;
+    };
   };
 
   meta = {