docs: Update gradle configuration readme

[scottgerring]

Issue #, if available:
#1358 (Update gradle documentation)
#1067 (Improve example coverage)

Description of changes:

Updates README to provide up-to-date gradle build instructions for Java11+.

Checklist

• Meet tenets criteria
• Update tests
• Update docs
• PR title follows conventional commit semantics

Breaking change checklist

RFC issue #:

• Migration process documented
• Implement warnings (if it can live side by side)

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[scottgerring]

@jeromevdl looking at the issue and your PR for the templates, I think this is all we need?

[jeromevdl]

Maybe give a try with a v8.0 of gradle not to force people to use the latest. Maybe mention to check their version with gradle -v or to update the version in the property file somewhere if they use the local gradlew.

[scottgerring]

@jeromevdl i'll add a complete gradle example in powertools-examples-core like Alexey has done for the other /CD tools and use that to work it out.

[scottgerring]

Maybe give a try with a v8.0 of gradle not to force people to use the latest. Maybe mention to check their version with gradle -v or to update the version in the property file somewhere if they use the local gradlew.

This is a pain to try and debug, with the gradle wrapper and the caching of deps. Fortunately I found some wording on their website:

Unless otherwise noted, all plugins require at least Java 8 and are targeted at Gradle 8.2.1.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.93%. Comparing base (787aa9d) to head (3342dbf).
⚠️ Report is 643 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1359   +/-   ##
=========================================
  Coverage     78.93%   78.93%           
  Complexity      652      652           
=========================================
  Files            74       74           
  Lines          2506     2506           
  Branches        259      259           
=========================================
  Hits           1978     1978           
  Misses          446      446           
  Partials         82       82           

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[scottgerring]

I've added a Gradle example, but for Java 8 only. It doesn't seem like there is an easy way to setup a JDK-independent gradle build like we have with maven, because the gradle wrapper itself needs to change depending on the JDK + aspect version.

[jeromevdl]

few comments...

[sonarqubecloud]

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