Write unit tests for build and sign release

[james-garriss]

🗣 Description

Moved some of the build and sign release into a function. Reused existing unit tests and wrote a new one.

Note: Testing Azure Sign Tool itself should be a functional test that is added to nightly tests. A new issue was created for this (#1520).

💭 Motivation and context

Closes: #1453

🧪 Testing

Ran workflow pipeline, checked the results.

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• PR targets the correct parent branch (e.g., main or release-name) for merge.
• Changes are limited to a single goal - eschew scope creep!
• Changes are sized such that they do not touch excessive number of files.
• All future TODOs are captured in issues, which are referenced in code comments.
• These code changes follow the ScubaGear [content style guide]
• Related issues these changes resolve are linked preferably via [closing keywords]
• All relevant type-of-change labels added.
• All relevant project fields are set.
• All relevant repo and/or project documentation updated to reflect these changes.
• Unit tests added/updated to cover PowerShell and Rego changes.
• All automated checks (e.g., linting, static analysis, unit/smoke tests) passed.

✅ Pre-merge checklist

• PR passed smoke test check.

• Feature branch has been rebased against changes from parent branch, as needed

  Use Rebase branch button below or use this reference to rebase from the command line.

• Resolved all merge conflicts on branch

• Notified merge coordinator that PR is ready for merge via comment mention

• Demonstrate changes to the team for questions and comments.
  (Note: Only required for issues of size Medium or larger)

✅ Post-merge checklist

• Feature branch deleted after merge to clean up repository.
• Verified that all checks pass on parent branch (e.g., main or release-name) after merge.

[schrolla]

Looks good functionally, but recommend some style and comment updates. See below.

[schrolla]

Functionally all good. Saw one missed comment removal and convert tabs to spaces in one spot. But nothing to hold things up. Would recommend addressing before merge though.

[james-garriss]

Saw one missed comment removal

Fixed

convert tabs to spaces in one spot

Searched via regex and no tabs found. In the example you highlight, note that it's red, meaning it's code that was replaced. So maybe you are seeing the old code that I removed?

Happy to replace any tabs that I can find.

[schrolla]

Thanks for the final clean ups, looks good to me.

[buidav]

I tested a modified version of this for ScubaConnect. All the pieces are working like a well oiled machine with the current code signing certificate.

Only have a small additional request to add a comment to the snippet of code that creates the release artifact.

[james-garriss]

@nanda-katikaneni