ci: remove self-hosted github action runner

[mattyg]

Summary

Depends on holochain/hc-github-config#62
Resolves #432 (runner machine still needs to be deprovisioned -- this is in-progress)

TODO:

• All code changes are reflected in docs, including module-level docs
• I ran the Nomad CI workflow successfully on my branch

Note that all commits in a PR must follow Conventional Commits before it can be merged, as these are used to generate the changelog

[cocogitto-bot]

✔️ 9373a71 - Conventional commits check succeeded.

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📥 Commits

Reviewing files that changed from the base of the PR and between b47c9f7 and 9373a71.

📒 Files selected for processing (1)

• .github/workflows/nomad.yaml

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ci/remove-self-hosted-action-runner

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[github-actions]

The following will be added to the changelog

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[0.5.0-dev.1] - 2025-12-22

CI

• Remove self-hosted github action runner