Update spark-k8s/Dockerfile

Co-authored-by: Siegfried Weber <[email protected]>

Author: maltesander

spark-k8s/Dockerfile

@@ -337,6 +337,7 @@ chown -h ${STACKABLE_USER_UID}:0 /stackable/spark/examples/jars/spark-examples.j
 # fix permissions
 chmod g=u /stackable/spark
 chmod g=u /stackable/jmx
+chmod g=u /stackable/run-spark.sh
 EOF
 
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