Dongjoon Hyun created SPARK-49272:
-------------------------------------

             Summary: Update `Dockerfile` to use `alpine/java:17-jdk` instead 
of `gradle:8.9.0-jdk17-jammy`
                 Key: SPARK-49272
                 URL: https://issues.apache.org/jira/browse/SPARK-49272
             Project: Spark
          Issue Type: Sub-task
          Components: Build
    Affects Versions: kubernetes-operator-0.1.0
            Reporter: Dongjoon Hyun


`alpine` Java 21 image is 65% smaller. And, we currently use grade wrapper to 
download newer image always.
{code}
$ docker images | head -n3
REPOSITORY                                TAG                                   
     IMAGE ID       CREATED         SIZE
alpine/java                               17-jdk                                
     c6b1a03c388c   6 days ago      318MB
gradle                                    8.9.0-jdk17-jammy                     
     28e51bcaedf1   5 weeks ago     710MB
{code}



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