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actions/setup-dotnet is not yet updated for net 5EnvironmentVariableTarget are the variables you put in withEnvironmentVariableTarget.Process is the only thing supported on linux.NET Core on macOS and Linux does not support per-machine or per-user environment variables.
actions/setup-dotnetEnvironmentVariableTargetEnvironmentVariableTarget.Process- name: Something
env:
SOME_ENV: ${{ ... }}