Run duneapi-client-go tests in CI

[charisra]

Summary

Adds a GitHub Actions CI workflow to run unit tests on push and PR.

Test plan

• CI passes on the PR
• E2E tests remain skipped (-short; need DUNE_API_KEY)

[charisra]

• Run duneapi-client-go tests in CI #29 👈 (View in Graphite)
• main

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[charisra]

bugbot run

[cursor]

PR Summary

Low Risk
CI-only change with no application or runtime code modified.

Overview
Adds a GitHub Actions workflow that runs on every push and pull_request.

The job checks out the repo, installs Go from go.mod, and runs go test -short -timeout=30s -race -cover ./... on ubuntu-latest.

^{Reviewed by Cursor Bugbot for commit c19cc72. Configure here.}

[cursor]

✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

^{Reviewed by Cursor Bugbot for commit c19cc72. Configure here.}