Adjust e2e test ClusterConfiguration min_memory

Author: ChristianZaccaria

tests/e2e/mnist_raycluster_sdk.py

@@ -37,7 +37,7 @@
         head_memory=2,
         min_cpus="500m",
         max_cpus=1,
-        min_memory=0.5,
+        min_memory=1,
         max_memory=2,
         num_gpus=0,
         instascale=False,