feat: add SESSION_COOKIE_AGE environment variable

[pogman-code]

Add SESSION_COOKIE_AGE environment variable to allow adjustment of session cookie expiration date (see: https://docs.djangoproject.com/en/dev/ref/settings/#session-cookie-age)

Closes/Resolves #1185

(Thanks @FuzzyGrim for pointing me to the solution 😉 )

[gemini-code-assist]

Summary of Changes

Hello @pogman-code, 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!

This pull request enhances the application's configurability by introducing a new environment variable, SESSION_COOKIE_AGE. This allows administrators to easily adjust the lifespan of session cookies without modifying code, providing greater control over user session management and security.

Highlights

• New Environment Variable: Introduced SESSION_COOKIE_AGE environment variable to control the expiration duration of session cookies.

Changelog

• src/config/settings.py
  • Added SESSION_COOKIE_AGE setting, configurable via environment variable.

Activity

• The author received assistance from @FuzzyGrim in identifying the solution for this feature.

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[gemini-code-assist]

Code Review

This pull request introduces a new environment variable SESSION_COOKIE_AGE to configure the session cookie's expiration time. The change is straightforward and correctly implemented. I've added one suggestion to improve code readability by replacing the magic number for the default cookie age with a calculation, which is consistent with other parts of the settings file.