ogma-core: Adapt cFS backend, template to support messages with multiple fields. Refs #625. - #626

The process '/home/runner/.ghcup/bin/cabal' failed with exit code 1

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