fix: Allow openagentpolicy host override

[jackylamhk]

Motivation and context

To accomodate different environments, set the setting variable IAM_OPA_HOST to retrieve an environment variable with the original value as the default.

Fixes this issue in the deployment guide:

Warning: The k8s service name of Open Policy Agent is fixed to opa by default. This is done to be compatible with CVAT 2.0 but limits this helm chart to a single release per namespace. The OPA url currently can´t be set as an environment variable. As soon as this is possible you can set cvat.opa.composeCompatibleServiceName to false in your value.override.yaml and configure the opa url as additional env.

How has this been tested?

Checklist

• I submit my changes into the develop branch
• I have created a changelog fragment
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues (see GitHub docs)
• I have increased versions of npm packages if it is necessary
  (cvat-canvas,
  cvat-core,
  cvat-data and
  cvat-ui)

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.

Summary by CodeRabbit

• Refactor
  • Updated the configuration for the IAM_OPA_HOST to dynamically retrieve its value from environment variables, enhancing flexibility in different deployment environments.

[coderabbitai]

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Walkthrough

The recent update involves enhancing the configuration flexibility of the cvat application by allowing the IAM_OPA_HOST setting to dynamically fetch its value from an environment variable. This change ensures that the application can be more easily configured in different environments without modifying the codebase.

Changes

File	Change Summary
cvat/settings/base.py	Updated the IAM_OPA_HOST setting to fetch its value from an environment variable with a default fallback.

🐰✨
In the land of code and byte,
A little change shines bright.
Now IAM_OPA_HOST can roam,
Fetching addresses like it's home.
Cheers to flexibility's new height! 🎉
🐰✨

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[azhavoro]

Let's close PR for now due to long inactivity. Feel free to reopen again.