Step1:

How to deploy a simple NodeJS express project
Watch this video: https://www.youtube.com/watch?v=djh-Uznj6nE

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Step 2:

How to handle NestJS specifics with Google Cloud App Engine:
This comment: https://stackoverflow.com/a/67372664/14819065

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Step 3:

CI/CD

The youtube video
And add this file

cloudbuild.yaml

**cloudbuild.yaml**

substitutions:
  _BRANCH_NAME: ${BRANCH_NAME}

steps:
  - name: 'gcr.io/cloud-builders/gcloud'
    args: ['app', 'deploy']

options:
  logging: CLOUD_LOGGING_ONLY