remove build secret reference

Author: ckhordiasma

.tekton/vllm-cuda-v2-19-push.yaml

@@ -301,8 +301,6 @@ spec:
           - $(params.build-platforms)
       name: build-images
       params:
-      - name: ADDITIONAL_SECRET
-        value: $(params.additional-build-secret)
       - name: IMAGE
         value: $(params.output-image)
       - name: DOCKERFILE