setup pixi before checkout

Author: Tobias-Fischer

.github/workflows/testpr.yml

@@ -47,16 +47,16 @@ jobs:
           - os: windows-2019
             platform: osx-arm64
     steps:
-    - uses: actions/checkout@v4
-      with:
-        persist-credentials: false # otherwise, the token used is the GITHUB_TOKEN, instead of your personal token
-        fetch-depth: 0 # otherwise, you will failed to push refs to dest repo
-
     - uses: prefix-dev/[email protected]
       with:
         environments: ${{ matrix.environment }}
         frozen: true
 
+    - uses: actions/checkout@v4
+      with:
+        persist-credentials: false # otherwise, the token used is the GITHUB_TOKEN, instead of your personal token
+        fetch-depth: 0 # otherwise, you will failed to push refs to dest repo
+
     # Workaround for https://github.com/RoboStack/ros-humble/pull/141#issuecomment-1941919816
     - name: Clean up PATH
       if: contains(matrix.os, 'windows')