Extracts sign+push logic into a reusable push-nix-cache action.
Both the site deploy and the image build now use it.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Use nix eval --raw --impure + builtins.getEnv instead of Python for
Nomad job JSON generation. Add flake-output input (default: default)
so projects can build non-default outputs like docs.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
S3_BUCKET and S3_ENDPOINT are config, not secrets. Move them to
inputs with defaults (s3.toph.so / nix-cache). Calling workflows
only need to supply AWS credentials, NIX_SIGNING_KEY, NOMAD_TOKEN.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>