[SPARK-51577] Make gradle build to automatically append SNAPSHOT suffix to version for non-release builds

### What changes were proposed in this pull request?

This PR makes gradle build automatically append `-SNAPSHOT` suffix to `version` for non-release builds

### Why are the changes needed?

This would help to automatically set up builds based on gradle release properties

### Does this PR introduce _any_ user-facing change?

No

### How was this patch tested?

Pass the CIs

### Was this patch authored or co-authored using generative AI tooling?

No

Closes apache#170 from jiangzho/main.

Authored-by: Zhou JIANG <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>

Author: jiangzho

build.gradle

@@ -34,7 +34,10 @@ assert JavaVersion.current().isCompatibleWith(JavaVersion.VERSION_17): "Java 17
 
 allprojects {
   group = "org.apache.spark.k8s.operator"
-  version = "0.1.0-SNAPSHOT"
+  version = "0.1.0"
+  if (!project.hasProperty('release')) {
+    version += "-SNAPSHOT"
+  }
 }
 
 tasks.register('buildDockerImage', Exec) {