Issue #4231: jib cli: add doc about jvm options

[scrat98]

Closes https://github.com/GoogleContainerTools/jib/issues/4231

[gemini-code-assist[bot]]

Summary of Changes

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This pull request addresses issue #4231 by enhancing the jib-cli/README.md file. It provides users with clear guidance on how to configure Java Virtual Machine (JVM) options for the Jib CLI, which is a Java-based application. This enhancement clarifies the process for passing runtime settings, such as proxy configurations, ensuring better usability and troubleshooting for advanced scenarios.

Highlights

• Jib CLI JVM Options Documentation: A new section has been added to the jib-cli/README.md to document how to configure JVM options for the Jib CLI.
• Environment Variables for JVM Options: The documentation clarifies that JIB_OPTS or JAVA_OPTS environment variables can be used to pass JVM options to the Jib CLI process.
• Proxy Configuration Example: The new section highlights that configuring proxies is a common use case for these JVM options, linking to the existing proxy configuration FAQ.

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