ci: add Windows unit test job

[preko-p]

Summary

• adds a separate test-unit-windows GitHub Actions job for Windows unit coverage
• preserves the existing Linux test-unit job and status-check name unchanged
• expands the existing make test-unit command directly with go test -mod=vendor -race -cover ./cmd/shp/... ./pkg/... so the Windows job does not depend on make

Fixes #64.

Testing

• docker run --rm -v "$PWD":/workspace -w /workspace golang:1.25 go test -mod=vendor -race -cover ./cmd/shp/... ./pkg/...
• docker run --rm -v "$PWD":/workspace -w /workspace golang:1.25 sh -c 'GOOS=windows GOARCH=amd64 CGO_ENABLED=0 go build -mod=vendor ./cmd/shp/...'
• git diff --check

Notes

The actual Windows unit test execution is intentionally left to upstream GitHub Actions. The existing Linux test-unit job remains unchanged so current branch protection/check names are not disturbed; maintainers can decide whether to make the new Windows job required.

This PR was prepared with AI assistance and reviewed before submission.

NONE

[openshift-ci]

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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds a Windows CI job to run Go unit tests alongside the existing unit-test workflow.

Changes:

• Introduces a test-unit-windows job running on windows-latest
• Sets up Go and runs go test with race detection and coverage on Windows

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