Local Test Server

[faogustavo]

• Instead of using a remote server for tests, use a local version that is started before you run tests
• This allows forks to properly run the entire test suite, as they will not need access to any test secrets

[Copilot]

🟢 Approval recommended

No blocking issues were identified; only minor documentation nits remain.

Pull request overview

This PR replaces the secret-backed remote test artifact service with a local Node.js server, enabling forked CI runs without test secrets.

Changes:

• Adds and starts a local artifact server in CI.
• Updates tests and artifact managers to use localhost.
• Removes obsolete secret handling and documents local setup.

File summaries

File	Reviewed changes
TESTING.md	Documents local server setup.
kmmbridge/src/test/kotlin/co/touchlab/kmmbridge/SpmLocalDevTest.kt	Removes remote server properties.
kmmbridge/src/test/kotlin/co/touchlab/kmmbridge/NonKmmBridgeTasksTest.kt	Removes remote server properties.
kmmbridge/src/test/kotlin/co/touchlab/kmmbridge/BasePluginTest.kt	Removes secret-file loading.
kmmbridge/src/test/kotlin/co/touchlab/kmmbridge/ArtifactManagerTest.kt	Validates local artifact URLs.
kmmbridge-test/src/main/kotlin/Extensions.kt	Configures the local test manager.
kmmbridge-test/src/main/kotlin/co/touchlab/kmmbridge/test/TestUploadArtifactManager.kt	Uses local upload/download endpoints.
.gitignore	Removes the obsolete secret ignore rule.
.github/workflows/build_mac.yml	Starts and waits for the local server.
.github/scripts/test-artifact-server.js	Implements the mock artifact server. The endpoint comment needs correction.

Review details

• Files reviewed: 9/10 changed files
• Comments generated: 2
• Review effort level: Lite

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