[Bug]: The Google App Engine deployment example doesn't work

[starkertyp]

Link to the documentation page or resource

https://strapi.io/documentation/developer-docs/latest/setup-deployment-guides/deployment/hosting-guides/google-app-engine.html

Describe the bug

The issue was introduced in #392. The fix to replace host with socketPath is only correct if mysql is used. For postgres it still needs to be host.

Additional context

No response

Suggested improvements or fixes

Maybe this could be changed to provide examples for both databases?

Related issue(s)/PR(s)

#392

[pwizla]

Thank you for opening this issue, and sorry for not replying earlier. We, unfortunately, didn't have time to focus on issues before now.
I've just fixed this through PR #944 and will close this issue.
If you encounter a similar issue with Strapi v4, please let us know by opening another issue. Thank you again!