Unable to Deploy Google API GATWAY using Cloudbuild

Question

I am trying to deploy API Gateway on top of cloud functions. For CI/CD I have cloudbuild which is already working smoothly for the project.

I ran gcloud API GATEWAY commands from my local machine and API Gateway deployed successfully.

Now I wrote these commands in cloudbuild.yaml, it is throwing "Internal Server Error" and no further logs on stacktrace.

steps:       
 - name: 'gcr.io/cloud-builders/gcloud'
          id: api
          entrypoint: bash
          args:
            - '-c'
            - |
              gcloud beta api-gateway apis create api --project=project;
    - name: 'gcr.io/cloud-builders/gcloud'
      id: api-config
      waitFor: ['api']
      entrypoint: bash
      args:
        - '-c'
        - |
          gcloud beta api-gateway api-configs create api-config --api=api --openapi-spec=openspec.yaml --project=project --backend-auth-service-account=deployment@project-dev.iam.gserviceaccount.com;
    - name: 'gcr.io/cloud-builders/gcloud'
      id: api-gateway
      waitFor: ['api-config']
      entrypoint: bash
      args:
        - '-c'
        - |
          gcloud beta api-gateway gateways create api-gateway --api=api --api-config=api-config --location=us-central1 --project=project

Is there a way to debug that?

How to deploye my API Gateway using cloudbuild?

openpsec.yaml is a configuration for api gateway as mentioned in the above link.