fix: Update Dockerfile to go 1.25

[Eun]

Pull Request

Description

The go.mod file uses go 1.25, update the Dockerfile so it also uses go 1.25 for building.

Testing

• I have tested these changes locally
• I have added/updated tests that prove my fix is effective or my feature works
• All existing tests pass

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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[Dumbris]

Trivial and correct: bumps the Docker builder image from golang:1.24-alpine to golang:1.25-alpine to match go 1.25.5 in go.mod. All required CI checks pass. (The auto-pass-qa-gate job errored with HTTP 403 because fork PRs receive a read-only GITHUB_TOKEN that can't POST commit statuses — the qa-gate status was posted manually; worth fixing the workflow to use pull_request_target or handle fork PRs so this doesn't recur.)