Try setting the PATH in a os-aware way

Author: radical

.github/workflows/run-tests.yml

@@ -58,19 +58,25 @@ jobs:
             exit 1
           }
 
+      # Adding .dotnet to GITHUB_PATH as this ensures that the tests running
+      # from the repo always use restored dotnet. For tests run from outside
+      # the repo we install system dotnet earlier in the build
+
       - name: Setup vars (Linux)
         if: ${{ inputs.os == 'ubuntu-latest' || inputs.os == 'macos-latest' }}
         run: |
           echo "DOTNET_SCRIPT=./dotnet.sh" >> $GITHUB_ENV
           echo "BUILD_SCRIPT=./build.sh" >> $GITHUB_ENV
           echo "TEST_RUN_PATH=${{ github.workspace }}/run-tests" >> $GITHUB_ENV
+          echo ${{ github.workspace }}/.dotnet >> $GITHUB_PATH
 
       - name: Setup vars (Windows)
         if: ${{ inputs.os == 'windows-latest' }}
         run: |
           echo "DOTNET_SCRIPT=.\dotnet.cmd" >> $env:GITHUB_ENV
           echo "BUILD_SCRIPT=.\build.cmd" >> $env:GITHUB_ENV
           echo "TEST_RUN_PATH=${{ github.workspace }}\run-tests" >> $env:GITHUB_ENV
+          echo ${{ github.workspace }}\.dotnet >> $env:GITHUB_PATH
 
       - name: Checkout code
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
@@ -231,15 +237,6 @@ jobs:
           --timeout ${{ inputs.testSessionTimeout }}
           ${{ inputs.extraTestArgs }}
 
-      # This ensures that the tests running from the repo always use
-      # restored dotnet.
-      # For tests run from outside the repo we install system dotnet
-      # earlier in the build
-      - name: Add .dotnet to PATH
-        if: ${{ ! inputs.requiresNugets }}
-        shell: bash
-        run: echo ${{ github.workspace }}/.dotnet >> $GITHUB_PATH
-
       - name: Run tests
         if: ${{ ! inputs.requiresNugets }}
         id: run-tests