chore: add build + test Just targets, basic GHA CI workflow

[markgoddard]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @markgoddard, 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 establishes foundational development practices by integrating build and test commands into the Justfile, making it easier to compile and run tests for the project. It also includes a minor update to the Go language version and refines the .gitignore file to ensure that generated artifacts and IDE-specific files are properly excluded from version control, contributing to a cleaner repository.

Highlights

• New Justfile Targets: Introduced build and test targets in the Justfile to streamline local development and testing workflows.
• Go Version Update: Updated the Go module's required version from 1.25.2 to 1.25.3 in go.mod.
• Gitignore Enhancements: Added new entries to .gitignore to exclude the compiled minispire binary and common IDE configuration directories (.idea, .vscode).

Ignored Files

• Ignored by pattern: .github/workflows/** (1)
  • .github/workflows/pull-request.yaml

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Code Review

This pull request adds useful build and test targets to the Justfile and a standard .gitignore. These are great additions for automating your workflow. The PR title mentions a "basic GHA CI workflow", but the workflow file itself seems to be missing from the changes. Was this intentional? I have one suggestion regarding the test target to improve build reproducibility and speed.