CI: try fixing windows path

Author: lucascolley

.github/workflows/tests.yml

@@ -16,15 +16,21 @@ jobs:
   tests:
     name: ${{ matrix.environment }} ${{ matrix.runs-on }}
     runs-on: ${{ matrix.runs-on }}
-    env:
-      XSREF_TABLES_PATH: "${{ github.workspace }}/xsref/tables"
     strategy:
       fail-fast: false
       matrix:
         environment: [tests-ci]
         runs-on: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:
+      - name: Set XSREF_TABLES_PATH
+        shell: bash
+        run: |
+          if [ "$RUNNER_OS" == "Windows" ]; then
+            echo "XSREF_TABLES_PATH=${{ github.workspace }}\\xsref\\tables" >> $GITHUB_ENV
+          else
+            echo "XSREF_TABLES_PATH=${{ github.workspace }}/xsref/tables" >> $GITHUB_ENV
+          fi
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - uses: prefix-dev/setup-pixi@92815284c57faa15cd896c4d5cfb2d59f32dc43d # v0.8.3
         with: