change working directory

.github/workflows/unittest-gpu.yml

@@ -16,12 +16,15 @@ permissions:
 jobs:
   unittest:
     runs-on: [self-hosted, linux, GPU]
-    defaults:
-      run:
-        working-directory: ./${{ github.event.pull_request.head.ref }}
     environment: Testing
     steps:
+    - name: Set up unique working directory
+      run: mkdir ${{ runner.temp }}/dj-${{ github.run_id }}
+      shell: bash
+
     - uses: actions/checkout@v3
+      with:
+        path: ${{ runner.temp }}/dj-${{ github.run_id }}
 
     - name: Setup docker compose
       working-directory: .github/workflows/docker
@@ -38,3 +41,8 @@ jobs:
       if: always()
       run: |
         docker compose down --remove-orphans
+
+    - name: Cleanup workspace
+      if: always()
+      run: |
+        rm -rf ${{ runner.temp }}/dj-${{ github.run_id }}