Configure CODEX_OUTPUT in auto-index-repo workflow

Author: ljcollins25

.github/workflows/auto-index-repo.yml

@@ -12,12 +12,15 @@ on:
 
 jobs:
   index:
-    env:
-      CODEX_OUTPUT: ${{ runner.temp }}/cdx
     runs-on: windows-latest
     steps:
     - uses: actions/checkout@v4
 
+    - name: "Setup env"
+      shell: pwsh
+      run: |
+        "CODEX_OUTPUT=${{ runner.temp }}/cdx" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+        
     - name: "Install Ref12.AutoCodex"
       shell: pwsh
       run: |