hermes-agent/.github/actions/nix-setup/action.yml
Siddharth Balyan 9a14540603
fix(nix): replace magic-nix-cache with Cachix (#17928)
* fix(nix): replace magic-nix-cache with Cachix

magic-nix-cache caused recurring CI failures (TwirpErrorResponse
ResourceExhausted) by hitting GitHub Actions Cache's 10 GB limit and
200 req/min rate limit. This was flagged as 'unfixable infra flake' in
#17836 but is actually a fixable architecture choice.

Switch to Cachix (dedicated binary cache, no GHA quota dependency):
- Replace DeterminateSystems/magic-nix-cache-action with cachix/cachix-action
- Add cachix-auth-token input to nix-setup composite action
- Pass CACHIX_AUTH_TOKEN secret through all three nix workflows
- continue-on-error: true so cache failures never block CI

Cache 'hermes-agent' is public at hermes-agent.cachix.org.
Devs can pull locally with: cachix use hermes-agent

* fix: correct cachix-action commit SHA pin

---------

Co-authored-by: Hermes Agent <hermes@nousresearch.com>
2026-04-30 17:38:58 +05:30

18 lines
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YAML

name: 'Setup Nix'
description: 'Install Nix and configure Cachix binary cache'
inputs:
cachix-auth-token:
description: 'Cachix auth token (enables push). Omit for read-only.'
required: false
default: ''
runs:
using: composite
steps:
- uses: DeterminateSystems/nix-installer-action@ef8a148080ab6020fd15196c2084a2eea5ff2d25 # v22
- uses: cachix/cachix-action@1eb2ef646ac0255473d23a5907ad7b04ce94065c # v17
with:
name: hermes-agent
authToken: ${{ inputs.cachix-auth-token }}
continue-on-error: true