ngr: Fix Gradle test runner by removing invocation of install target

[amotl]

Problem

The Gradle test runner failed to invoke ./gradlew install, because such a target did not exist.

References

• ngr: Task 'install' not found in root project 'java-spring'. #24
• https://github.com/crate/crate-sample-apps/tree/main/java-spring

Solution

Remove invoking the install target and see if we can get along without.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c30bcc1) 88.61% compared to head (481bb9a) 88.59%.

❗ Current head 481bb9a differs from pull request most recent head 9bb3d09. Consider uploading reports for the commit 9bb3d09 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
- Coverage   88.61%   88.59%   -0.03%     
==========================================
  Files          17       17              
  Lines         562      561       -1     
==========================================
- Hits          498      497       -1     
  Misses         64       64              

Flag	Coverage Δ
main	74.50% <ø> (+0.13%)	⬆️
ngr	72.54% <ø> (-0.05%)	⬇️

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[matriv]

Don't you need to run a gradle task here? like ./gradlew build?