[WIP] Fix path export

Author: ratheron

.github/workflows/testing.yml

@@ -22,7 +22,7 @@ jobs:
       - name: Install Pixi
         run: |
           curl -fsSL https://pixi.sh/install.sh | bash 
-          export PATH="$HOME/.pixi/bin:$PATH" 
+          echo "$HOME/.pixi/bin" >> $GITHUB_PATH
           pixi --version
 
       - name: Install test environment