fix: build unstructured for resolve template

Author: siyul-park

README.md

@@ -71,7 +71,7 @@ Try a basic HTTP request handler using [ping.yaml](./examples/ping.yaml):
 Start the workflow with:
 
 ```sh
-./dist/uniflow start --from-specs ./examples/ping.yaml --env=PORT=8000
+./dist/uniflow start --from-specs ./examples/ping.yaml --env PORT=8000
 ```
 
 Verify by calling the HTTP endpoint:

README_kr.md

@@ -71,7 +71,7 @@ make build
 다음 명령어로 워크플로우를 실행합니다:
 
 ```sh
-./dist/uniflow start --from-specs ./examples/ping.yaml --env=PORT=8000
+./dist/uniflow start --from-specs ./examples/ping.yaml --env PORT=8000
 ```
 
 정상 작동 여부를 확인하려면 HTTP 엔드포인트를 호출하세요:

pkg/symbol/loader.go

@@ -106,6 +106,8 @@ func (l *Loader) Load(ctx context.Context, specs ...spec.Spec) error {
 			errs = append(errs, err)
 		} else if err := unstructured.Bind(secrets...); err != nil {
 			errs = append(errs, err)
+		} else if err := unstructured.Build(); err != nil {
+			errs = append(errs, err)
 		} else if decode, err := l.scheme.Decode(unstructured); err != nil {
 			errs = append(errs, err)
 		} else {