Broken %PATH% for the regular cmd environment

After running the installation all the %PATH% values are gone on the regular `cmd` shell.

```
- name: Debug PATH before Swift installation
shell: pwsh
run: |
Write-Host "PATH before Swift installation:"
Write-Host $env:PATH
- name: Debug PATH in cmd shell
shell: cmd
run: |
echo %PATH%
- name: Install Swift toolchain
uses: compnerd/gha-setup-swift@main
with:
branch: swift-${{ env.SWIFT_VERSOIN }}-release
tag: ${{ env.SWIFT_VERSOIN }}-RELEASE
- name: Debug PATH after Swift installation
shell: pwsh
run: |
Write-Host "PATH after Swift installation:"
Write-Host $env:PATH
- name: Debug PATH in cmd shell
shell: cmd
run: |
echo %PATH%
```

The `pwsh` works as expected, but the `cmd` %PATH% is empty after running the swift installation.