Fix graphql api not returning stdout/stderr as strings

admin_api/admin_api.go

@@ -222,7 +222,7 @@ func createSchema(db database.Database) (graphql.Schema, error) {
 				Description: "The stdout used to validate the run.",
 				Resolve: func(p graphql.ResolveParams) (interface{}, error) {
 					if run, ok := p.Source.(database.Run); ok {
-						return run.Stdout, nil
+						return string(run.Stdout), nil
 					}
 					return nil, nil
 				},
@@ -232,7 +232,7 @@ func createSchema(db database.Database) (graphql.Schema, error) {
 				Description: "The stderr used to validate the run.",
 				Resolve: func(p graphql.ResolveParams) (interface{}, error) {
 					if run, ok := p.Source.(database.Run); ok {
-						return run.Stderr, nil
+						return string(run.Stderr), nil
 					}
 					return nil, nil
 				},