use consistent naming for route files

distrobuild/routes/__init__.py

 from fastapi import APIRouter
 
-from distrobuild.routes import build, packages, bootstrap
+from distrobuild.routes import builds, packages, bootstrap
 
 _base_router = APIRouter(prefix="/api")
 
@@ -8,6 +8,6 @@ _base_router = APIRouter(prefix="/api")
 def register_routes(app):
     _base_router.include_router(packages.router)
     _base_router.include_router(bootstrap.router)
-    _base_router.include_router(build.router)
+    _base_router.include_router(builds.router)
 
     app.include_router(_base_router)