correct cleanup

Author: davegarthsimpson

.github/workflows/build.yml

@@ -431,7 +431,10 @@ jobs:
 
       - name: Manual Clean up for self-hosted runners
         if: runner.os == 'Windows' && matrix.config.working-directory
-        run: rmdir /s /q "${{ matrix.config.working-directory }}"
+        shell: cmd
+        run: |
+          rmdir /s /q "${{ matrix.config.working-directory }}"
+          rmdir /s /q "C:\actions-runner\_work\arduino-ide"
 
   merge-channel-files:
     needs: