Upgrade postgres 15.8

[annagav]

What are the relevant tickets?

Fix https://github.com/mitodl/hq/issues/6579

Description (What does it do?)

Upgrade postgres 15.8

How can this be tested?

Everything should work as expected

[gemini-code-assist]

Hello @annagav, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

Summary of Changes

This pull request upgrades the Postgres version in the docker-compose.yml file from 12.7 to 15.8. It also adds a volume for the database to persist data across container restarts. The stated intent is to address issue #6579.

Highlights

• Postgres Version Upgrade: The Postgres version has been upgraded from 12.7 to 15.8 in the docker-compose.yml file.
• Database Volume Addition: A new volume db-data has been added to the docker-compose.yml file to persist the Postgres database data.

Changelog

• docker-compose.yml
  • Upgraded the Postgres image version from 12.7 to 15.8 on line 23.
  • Added a volume mount for the db service to persist data at /var/lib/postgresql/data on lines 28-29.
  • Added a db-data volume definition on line 132.

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---

A database's upgrade,
To newer version's stage,
Data persists now,
No more data pow,
Volumes save the day, hooray!

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[gemini-code-assist]

Code Review

This pull request upgrades the Postgres version in the docker-compose file. The changes seem straightforward and necessary for keeping the application up-to-date with security patches and new features. The addition of a volume for the database is also a good practice for persisting data.

Merge Readiness

The changes appear to be correct and necessary. However, it's crucial to ensure that all application components are compatible with the new Postgres version. Since the description mentions 'Everything should work as expected', it's assumed that compatibility testing has been performed. Given the absence of any critical or high severity issues, the pull request seems ready for merging, contingent upon successful compatibility testing. I am unable to directly approve the pull request, and other reviewers should review and approve this code before merging.