Add GitHub Actions workflow to run tests on PRs

[Copilot]

Tests added in PR #294 are not executed in CI/CD. This adds a workflow to gate PRs on test success.

Changes

• .github/workflows/tests.yml - Runs on PRs and pushes to master
  • Executes test_apidiscovery.py (Python unit tests)
  • Executes test_integration.sh (end-to-end spec processing verification)
  • Installs dependencies: urllib3>=2.0,<3.0, jq, curl
  • Sets permissions: contents: read per security best practices

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Tests aren't run by github actions on PRs</issue_title>
<issue_description>This PR #294 added tests but they aren't run as part of CI/CD.

We should add a github action which runs these tests as a PR gate before merging.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Tests aren't run by github actions on PRs #295

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[brendandburns]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: brendandburns, Copilot

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