docs: expand baseJobTemplate documentation

[kingsley-123]

Summary

Fixes #444.

Added comprehensive examples for environment variables, secret references, and image pull secrets configuration in the baseJobTemplate.

Requirements

• Contributing guide has been read
• Title follows the conventional commits format
• Body includes Closes <issue>, if available
• Added/modified configuration includes a descriptive comment for documentation generation
• Unit tests are added/updated
• Deprecation/removal checks are added in templates/NOTES.txt
• Relevant labels are added
• Draft status is used until ready for review

[mitchnielsen]

Thanks so much for picking this one up @kingsley-123.

When I started reviewing this, I couldn't help but think this documentation probably fits better in the Prefect repo because this isn't specific to the Helm charts - all users could benefit from clearer notes on this topic.

I looked through what docs we have on this so far and found two relevant pages:

• https://docs.prefect.io/v3/how-to-guides/deployment_infra/kubernetes#configure-work-pool-options - has some notes (in a markdown callout block) with an example on how to provide a variable and then reference it. I think this deserves its own dedicated header in the document and expanded upon.
• https://docs.prefect.io/v3/how-to-guides/deployment_infra/manage-work-pools#base-job-template - has a brief note on base job templates, and then links to a page on how to override job variables. Not as relevant but should probably be cross-linked with the link above.

What do you think? Will also loop in @zzstoatzz

[kingsley-123]

@mitchnielsen

Hi,

Thanks for reviewing my PR and for your thoughtful feedback. I appreciate the suggestion about potentially moving this documentation to the main Prefect repository for wider visibility.

I agree that these examples would benefit all users, not just those using the Helm charts. I'm happy to take either approach:

1. Continue with this PR to improve the Helm-specific documentation
2. Close this PR and create a new one in the main Prefect repository with expanded examples
3. Do both - keep simpler notes here while creating more comprehensive documentation in the main repo

I also noticed one of the tests is failing for version 1.31.0 while passing for newer versions. Would you happen to have any logs or insights on what might be causing this issue?

Please let me know which direction you prefer, and I'll be glad to make the necessary adjustments. I'm committed to improving the documentation wherever it will be most helpful to users.

Thanks again for your guidance.

[mitchnielsen]

3. Do both - keep simpler notes here while creating more comprehensive documentation in the main repo

I'm leaning toward this option - we can provide a brief Helm-specific example of setting a custom base job template, and then link out to the Prefect docs for more details on how to configure that object.

I also noticed one of the tests is failing for version 1.31.0 while passing for newer versions. Would you happen to have any logs or insights on what might be causing this issue?

Looks like this may have been a transient error. I've retried the job and it passed.

I'm committed to improving the documentation wherever it will be most helpful to users.

Very much appreciated 🤝

[kingsley-123]

@mitchnielsen

Hi,

I've updated the PR to simplify the documentation as you requested. The changes now include:

• A basic image pull secrets example specific to Helm usage
• A reference link to the comprehensive documentation (which I'll create in the main Prefect repo as our next step)
• Removed all the detailed examples to keep this focused on Helm-specific guidance

Ready for your review. Thanks for the guidance!

[mitchnielsen]

I don't think this link is working for me. I wonder if we want one or both of these:

• https://docs.prefect.io/v3/how-to-guides/deployment_infra/kubernetes#configure-work-pool-options
• https://docs.prefect.io/v3/how-to-guides/deployment_infra/manage-work-pools#base-job-template

[mitchnielsen]

Suggested change

	```json
	```json