Architecture Mismatch using Action on M1 Mac Mini

[lostpanda85]

Description:
When attempting to use this action on an M1 Mac Mini, the action fails and shows this output.

2025-12-13T15:40:54.9907680Z   DOTNET_ROOT: /Users/<my user directory>/.dotnet
2025-12-13T15:40:54.9908150Z ##[endgroup]
2025-12-13T15:40:55.0243290Z Failed to load /Users/<my user directory>/.dotnet/host/fxr/10.0.1/libhostfxr.dylib, error: dlopen(/Users/<my user directory>/.dotnet/host/fxr/10.0.1/libhostfxr.dylib, 0x0001): tried: '/Users/<my user directory>/.dotnet/host/fxr/10.0.1/libhostfxr.dylib' (mach-o file, but is an incompatible architecture (have 'x86_64', need 'arm64e' or 'arm64')), '/System/Volumes/Preboot/Cryptexes/OS/Users/<my user directory>/.dotnet/host/fxr/10.0.1/libhostfxr.dylib' (no such file), '/Users/<my user directory>/.dotnet/host/fxr/10.0.1/libhostfxr.dylib' (mach-o file, but is an incompatible architecture (have 'x86_64', need 'arm64e' or 'arm64'))
2025-12-13T15:40:55.0247880Z The library libhostfxr.dylib was found, but loading it from /Users/<my user directory>/.dotnet/host/fxr/10.0.1/libhostfxr.dylib failed
2025-12-13T15:40:55.0248810Z   - Installing .NET prerequisites might help resolve this problem.
2025-12-13T15:40:55.0249450Z      https://go.microsoft.com/fwlink/?linkid=2063366
2025-12-13T15:40:55.0286660Z ##[error]Process completed with exit code 130.

I have verified that my mac itself is able to build using the local CLI.

Here's my dotnet info from my mac showing that the local CLI is pulling the correct architecture.

An interesting note, using this action with Gitea worked perfectly fine, but when I migrated to GitHub, I started seeing this issue. Not sure if this detail is relevant.

Task version:
5

Platform:

• Ubuntu
• macOS
• Windows

Runner type:

• Hosted
• Self-hosted

Repro steps:

BuildAPI:
    runs-on: self-hosted
    steps:
      - name: Check out repository code
        uses: actions/checkout@v5
      - name: Setting up .Net CLI
        uses: actions/setup-dotnet@v5
        with:
          dotnet-version: '8.0.x'
      - name: Build API
        run: dotnet build follicleAPI

The repo is private, but I am able to grant access to it -> https://github.com/lostpanda85/follicle/actions/runs/20194241737/job/57975890828

Expected behavior:
The correct architecture being downloaded (Arm64) instead of x86-64

Actual behavior:
x86-64 version of the SDK is being grabbed and used instead of the correct version.

[mahabaleshwars]

Hi @lostpanda85,
Thank you for creating this issue. We will investigate it and provide feedback as soon as we have some updates.