nix profile install fails on ubuntu-24.04-arm runner

[msgilligan]

I am using install-nix-action to build secp256k1-jdk and it works perfectly for ubuntu-24.04 and macOS-14. I opened a PR to add ubuntu-24.04-arm and I get the following failure during nix profile install:

nix profile install nixpkgs#secp256k1
  shell: /usr/bin/bash -e {0}
  env:
    JAVA_HOME: /opt/hostedtoolcache/Java_Temurin-Hotspot_jdk/23.0.1-11/arm64
    JAVA_HOME_23_ARM64: /opt/hostedtoolcache/Java_Temurin-Hotspot_jdk/23.0.1-11/arm64
    TMPDIR: /home/runner/work/_temp
error: getting status of '/home/runneradmin/.config/nix/registry.json': Permission denied
Error: Process completed with exit code 1.

I'm not sure what difference in the -arm runner is causing this, but hopefully there is a way to resolve this.

• Workflow file: https://github.com/bitcoinj/secp256k1-jdk/blob/master/.github/workflows/gradle.yml
• Failing job: https://github.com/bitcoinj/secp256k1-jdk/actions/runs/12816255811/job/35736753247

[msgilligan]

I created PR #221 to run the tests for install-nix-action on the GitHub ARM runner and this failure looks related:

https://github.com/cachix/install-nix-action/actions/runs/12817083173/job/35739671809?pr=221

Run cachix use cachix
  cachix use cachix
  shell: /usr/bin/bash -e {0}
  env:
    nixpkgs_channel: nixpkgs=channel:nixos-24.11
    oldest_supported_installer: nix-2.8.0
    NIX_PATH: nixpkgs=channel:nixos-24.11
    TMPDIR: /home/runner/work/_temp
cachix: /home/runneradmin/.config/nix: createDirectory: permission denied (Permission denied)
Error: Process completed with exit code 1.

[msgilligan]

It looks like the issue I am seeing was caused by this upstream issue: actions/partner-runner-images#27

The workaround in that issue solved my problem.

I'm going to close this since we have PR #221 to track the upstream issue.