fix: correct git_describe in /health (#383)

* fix: add missing Version component in OpenAPI definition

* fix: allow tag / dirty in git describe

crates/tabby/build.rs

@@ -4,6 +4,10 @@ use vergen::EmitBuilder;
 
 fn main() -> Result<(), Box<dyn Error>> {
     // touch
-    EmitBuilder::builder().all_build().all_git().emit()?;
+    EmitBuilder::builder()
+        .all_build()
+        .all_git()
+        .git_describe(true, true, None)
+        .emit()?;
     Ok(())
 }

crates/tabby/src/serve/mod.rs

@@ -42,6 +42,7 @@ OpenAPI documentation for [tabby](https://github.com/TabbyML/tabby), a self-host
         completions::Segments,
         completions::Choice,
         health::HealthState,
+        health::Version,
     ))
 )]
 struct ApiDoc;