[SPARK-53471] Correct entrypoint.sh for Openshift

[Reamer]

What changes were proposed in this pull request?

This change performs string interpolation during the creation of the temporary file.

Why are the changes needed?

Start problems due to incorrect evaluation of the content.

Exception in thread "main" java.lang.IllegalArgumentException: basedir must be absolute: -anonymous uid}/.ivy2/local
	at org.apache.ivy.util.Checks.checkAbsolute(Checks.java:48)
	at org.apache.ivy.plugins.repository.file.FileRepository.setBaseDir(FileRepository.java:137)
	at org.apache.ivy.plugins.repository.file.FileRepository.<init>(FileRepository.java:44)
	at org.apache.spark.deploy.SparkSubmitUtils$.createRepoResolvers(SparkSubmit.scala:1269)
	at org.apache.spark.deploy.SparkSubmitUtils$.buildIvySettings(SparkSubmit.scala:1376)
	at org.apache.spark.util.DependencyUtils$.resolveMavenDependencies(DependencyUtils.scala:182)
	at org.apache.spark.deploy.SparkSubmit.prepareSubmitEnvironment(SparkSubmit.scala:334)
	at org.apache.spark.deploy.SparkSubmit.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:964)
	at org.apache.spark.deploy.SparkSubmit$$anon$1.run(SparkSubmit.scala:176)
	at org.apache.spark.deploy.SparkSubmit$$anon$1.run(SparkSubmit.scala:174)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/javax.security.auth.Subject.doAs(Subject.java:423)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1878)
	at org.apache.spark.deploy.SparkSubmit.doRunMain$1(SparkSubmit.scala:174)
	at org.apache.spark.deploy.SparkSubmit.submit(SparkSubmit.scala:217)
	at org.apache.spark.deploy.SparkSubmit.doSubmit(SparkSubmit.scala:91)
	at org.apache.spark.deploy.SparkSubmit$$anon$2.doSubmit(SparkSubmit.scala:1120)
	at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:1129)
	at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

Does this PR introduce any user-facing change?

No

How was this patch tested?

On my Openshift 4.17 platform

[Reamer]

ping @Yikun and @pan3793