build.mcpp: four channels a rule package had no way to reach the engine through #390

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Canceling since a higher priority waiting request for ci-openkal cross-build (3 hosts × 3 targets)-refs/pull/587/merge exists

The operation was canceled.

Canceling since a higher priority waiting request for ci-openkal cross-build (3 hosts × 3 targets)-refs/pull/587/merge exists

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@v4, actions/checkout@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/