Clean up Docker images on HPU and CPU benchmarks (#106)

* [no ci] Clean up Docker images on HPU and CPU benchmarks

Signed-off-by: Huy Do <huydhn@gmail.com>

* [no ci] Minor tweak

Signed-off-by: Huy Do <huydhn@gmail.com>

---------

Signed-off-by: Huy Do <huydhn@gmail.com>

Author: huydhn

.github/workflows/vllm-benchmark.yml

@@ -192,6 +192,12 @@ jobs:
         with:
           registry-type: public
 
+      - name: Clean up unused Docker images
+        if: env.DEVICE_NAME == 'hpu' || contains(matrix.runner, 'gnr')
+        run: |
+          set -eux
+          docker image prune -a -f || true
+
       - name: Check for last benchmark commit
         working-directory: vllm-benchmarks
         env: