Run integration test in Github Action CI workflow.

[dadiorchen]

The prerequisite of this issue is: #329 #328
Set Github Action workflow to run our integration tests under client/cypress/integration.
The major problem is: how to connect to a DB when running tests.
Here are some relative articles:
https://docs.github.com/en/actions/configuring-and-managing-workflows/creating-postgresql-service-containers

[nmcharlton]

See related issue #411