Define environment requirements for Moodle 5.1

[HuongNV13]

More details:
https://moodle.atlassian.net/browse/MDL-85362

[Copilot]

Pull Request Overview

This PR updates the PostgreSQL database requirements for Moodle 5.1 by upgrading the minimum supported PostgreSQL version from 14 to 15, aligning with the environment requirements defined in MDL-85362.

• Updates PostgreSQL Docker image version in GitHub Actions configuration

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.33%. Comparing base (b2e64bb) to head (57f2737).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #361   +/-   ##
=========================================
  Coverage     88.33%   88.33%           
  Complexity      763      763           
=========================================
  Files            77       77           
  Lines          2348     2348           
=========================================
  Hits           2074     2074           
  Misses          274      274           

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[mickhawkins]

Hi @HuongNV13,

Thanks for working on this, the change you've made looks correct, I'm just wondering whether we need to update any of these:

1. Changelog (and potentially minor version bump?)
2. .github/workflows/test.yml
3. The Travis configs (.travis.yml or .travis.dist.yml) (not sure if these matter since they're going away).

[HuongNV13]

Thanks, @mickhawkins
I have added new lines to the changelog.

.github/workflows/test.yml is designed to test selftest for this repo, but yes, I have modified it to Postgres 15

According to Travis CI, it has been deprecated in 4.5.8 and will be removed in 5.0.0.

Cheers!

[mickhawkins]

Thanks @HuongNV13, this looks good to me.