ci(vllm-tensorizer): Separate BuildKit cache slots per matrix variant

Author: JustinPerlman

.github/workflows/vllm-tensorizer.yml

@@ -30,6 +30,7 @@ jobs:
       image-name: vllm-tensorizer
       folder: vllm-tensorizer
       tag-suffix: ${{ matrix.tag-suffix }}
+      cache-key: ${{ matrix.tag-suffix }}
       build-contexts: |
         common=common
       object-storage-secrets: true