[SPARK-30743][K8S][TESTS] Use JRE instead of JDK in K8S test docker image
### What changes were proposed in this pull request? This PR aims to replace JDK to JRE in K8S integration test docker images. ### Why are the changes needed? This will save some resources and make it sure that we only need JRE at runtime and testing. - https://lists.apache.org/thread.html/3145150b711d7806a86bcd3ab43e18bcd0e4892ab5f11600689ba087%40%3Cdev.spark.apache.org%3E ### Does this PR introduce any user-facing change? No. This is a dev-only test environment. ### How was this patch tested? Pass the Jenkins K8s Integration Test. - https://github.com/apache/spark/pull/27469#issuecomment-582681125 Closes #27469 from dongjoon-hyun/SPARK-30743. Authored-by: Dongjoon Hyun <dhyun@apple.com> Signed-off-by: Dongjoon Hyun <dhyun@apple.com>
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# limitations under the License.
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#
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FROM openjdk:8-jdk-slim
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FROM openjdk:8-jre-slim
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ARG spark_uid=185
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