Action doesn't complete installation of dotnet on macos

[Yury-Fridlyand]

Description:
Installation on macos isn't completed as it happens on linux runner.
In order to keep CI jobs working properly, we have to do extra steps just to ensure that proper version of SDK is used. That increases complexity and maintenance costs.

Task version:
v4

Platform:

• Ubuntu
• macOS
• Windows

Runner type:

• Hosted
• Self-hosted

Repro steps:

jobs:
    experiment:
        runs-on: macos-14
        steps:
            - name: check
              run: |
                  dotnet --info || true
                  which dotnet || true
            - name: Set up dotnet
              uses: actions/setup-dotnet@v4
              with:
                  dotnet-version: '6.0'
            - name: check
              run: |
                  dotnet --info || true
                  which dotnet || true

Expected behavior:
On macos runner, Base path remains unchanged and refers to incorrect sdk version

 Base Path:   /Users/runner/.dotnet/sdk/9.0.102/

Actual behavior:
On linux runner, Base path changes after running the action from

 Base Path:   /usr/lib/dotnet/sdk/8.0.112/

to

 Base Path:   /usr/share/dotnet/sdk/6.0.428/

[priya-kinthali]

Hello @Yury-Fridlyand👋,
Thank you for reporting this issue. We will investigate it and get back to you as soon as we have some feedback.

[Yury-Fridlyand]

Thanks!