[FLINK-12416][FLINK-12375] Fix docker build scripts on Flink-1.8

[Myasuka]

What is the purpose of the change

This PR fix docker build script error from Flink-1.8 and also fix FLINK-12375 to give proper persimmon to job jar package.

Brief change log

• Change docker build script and related Dockerfile.
• Change related README

Verifying this change

I verify this change manually.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? not applicable

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• ✅ 1. The [description] looks good.
  • Approved by @dawidwys [committer]
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  • Approved by @dawidwys [committer]
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[dawidwys]

@flinkbot approve-until consensus

[knaufk]

LGTM. I thought a bit about these job-mode docker images and the utilities we provide for them and have opened: https://issues.apache.org/jira/browse/FLINK-12546. Let me know what you think.

[Myasuka]

@knaufk Thanks for your review! I just leave some feedback in FLINK-12546.

[tillrohrmann]

Thanks for providing this fix @Myasuka. I've tested it and it produces the correct docker images on my machine. Merging.