Build testnet-v1.72.1 (#384)

Author: jasonxh

.github/workflows/docker.yaml

@@ -10,7 +10,7 @@ on:
       - main
 
 env:
-  SUI_GIT_REF: mainnet-v1.71.1
+  SUI_GIT_REF: testnet-v1.72.1
 
 concurrency: docker