Add missing file

databuild/service/openapi_spec_generator.rs

@@ -0,0 +1,35 @@
+use databuild::service::BuildGraphService;
+use std::collections::HashMap;
+
+#[tokio::main]
+async fn main() {
+    // Disable logging to keep output clean
+    log::set_max_level(log::LevelFilter::Off);
+    
+    // Create a minimal service instance for OpenAPI generation
+    let service = match BuildGraphService::new(
+        "sqlite://:memory:",  // Use in-memory database for spec generation
+        "//example:graph".to_string(),
+        "job_lookup".to_string(),
+        HashMap::new(),
+    ).await {
+        Ok(service) => service,
+        Err(e) => {
+            eprintln!("Failed to create service for OpenAPI generation: {}", e);
+            std::process::exit(1);
+        }
+    };
+    
+    // Generate and print OpenAPI spec
+    let spec = service.generate_openapi_spec();
+    match serde_json::to_string_pretty(&spec) {
+        Ok(json) => {
+            println!("{}", json);
+            std::process::exit(0);
+        }
+        Err(e) => {
+            eprintln!("Failed to serialize OpenAPI spec: {}", e);
+            std::process::exit(1);
+        }
+    }
+}