Hi @d_w
This was a year ago and I moved my instance to Heroku, so I don’t know if that’s still up-to-date. You can see that the node runtime is v12 for instance. Anyway, this is what my app.yaml looked like. I hope that can help:
runtime: nodejs12
instance_class: F2
env_variables:
HOST: '0.0.0.0'
NODE_ENV: 'production'
ENV_PATH: './.env.prod'
DATABASE_NAME: 'strapi'
DATABASE_USERNAME: 'your_db_username_here'
DATABASE_PASSWORD: 'your_db_password_here'
INSTANCE_CONNECTION_NAME: 'your_instance_name'
DB_SOCKET_PATH: '/cloudsql/your_instance_name'
beta_settings:
cloud_sql_instances: 'cloud_sql_instance_name'