ASPNETCORE_ENVIRONMENT should be changed to Staging or Production based on deployment environment.

Read SigningKey(base64 encoded) from environment variable
Read DbConnectionString from environment variable

Refer to https://codelabs.developers.google.com/codelabs/cloud-app-engine-aspnetcore/#1

0.Register your application for Cloud SQL Admin API in Google Cloud Platform https://console.cloud.google.com/flows/enableapi?apiid=sqladmin&redirect=https:%2F%2Fconsole.cloud.google.com&_ga=2.244852229.-1628980075.1568042064&_gac=1.216462692.1569770225.Cj0KCQjwrMHsBRCIARIsAFgSeI0nvZjimGuKWdqhSpTUtXBFyzfCKZV3ObOk-r0GqVcIRGWRBbka0LMaAge9EALw_wcB

0. Install gcloud cli
1. dotnet publish -c Release
2. cd to publish folder, copy app.yaml to this folder
3. gcloud config set project fvmembership-ewallet
4. gcloud beta app deploy

https://cloud.google.com/sql/docs/mysql/connect-app-engine