Extract shared BOM build conventions

[jamesfredley]

Summary

This PR reduces duplicated Gradle BOM build logic by moving the shared publication, POM customization, constraint extraction, and release snapshot validation conventions into org.apache.grails.buildsrc.bom-conventions.

The BOM build scripts now keep only BOM-specific inputs such as descriptions, dependency declarations, and variant-specific dependency sets. The shared plugin owns the common task wiring and POM mutation behavior used by the seven Grails BOM projects.

Changes

• Add BomConventionsPlugin in build-logic/plugins and register it as org.apache.grails.buildsrc.bom-conventions.
• Apply the shared plugin in all seven BOM projects.
• Preserve BOM-specific dependency and platform declarations in each BOM script.
• Reduce duplicated Groovy module override maps in dependencies.gradle while leaving one literal coordinate list for Dependabot visibility.
• Remove unreachable BOM override branches for Micronaut/Hibernate variants.
• Address Copilot feedback by using the configured gradleBuildProjects group mapping when registering Gradle-build artifacts for POM property replacement.
• Add TestKit coverage for shared BOM plugin wiring and Gradle-build artifact POM property generation.

Verification

• JAVA_HOME=/tmp/opencode/jdk21 ./gradlew :build-logic-root:build-logic:compileGroovy :build-logic-root:build-logic:test
• JAVA_HOME=/tmp/opencode/jdk21 ./gradlew :build-logic-root:build-logic:test --tests org.apache.grails.buildsrc.BomConventionsPluginSpec
• Generated all seven BOM POMs with -PincludeMicronautProjects.
• Ran extractConstraints for all seven BOMs with -PincludeMicronautProjects.
• Compared generated constraints against a clean origin/8.0.x baseline: no differences.
• Compared generated POMs against the baseline: only the intended base BOM improvement differs, where Gradle-build artifacts now use generated version properties instead of inline 8.0.0-SNAPSHOT versions.

Notes

• LSP diagnostics are unavailable locally for .groovy / .gradle because no Groovy/Gradle LSP is configured.
• The full aggregate gate currently has unrelated baseline failures on origin/8.0.x (GraphQL static compile errors and MongoDB timeout flakes), reproduced in a clean baseline worktree.

[Copilot]

Pull request overview

This pull request extracts repeated Grails BOM build logic into a shared build-logic Gradle plugin, then applies it across the various BOM subprojects to reduce duplication and centralize publication / POM / constraints behavior.

Changes:

• Add org.apache.grails.buildsrc.bom-conventions plugin to encapsulate common BOM conventions (publication hooks, constraints extraction wiring, snapshot validation, POM customization).
• Update Grails BOM subprojects (default/base/hibernate*/micronaut*) to use the shared plugin and remove duplicated build script logic.
• Refactor dependencies.gradle to generate Groovy module dependency maps via a shared helper and remove now-unreachable override branches.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
grails-bom/micronaut/build.gradle	Switch Micronaut BOM to shared bom-conventions plugin; remove duplicated publication/constraints logic.
grails-bom/hibernate7/build.gradle	Switch Hibernate 7 BOM to shared bom-conventions plugin; remove duplicated publication/constraints logic.
grails-bom/hibernate7-micronaut/build.gradle	Switch Hibernate 7 + Micronaut BOM to shared bom-conventions plugin; remove duplicated publication/constraints logic.
grails-bom/hibernate5/build.gradle	Switch Hibernate 5 BOM to shared bom-conventions plugin; remove duplicated publication/constraints logic.
grails-bom/hibernate5-micronaut/build.gradle	Switch Hibernate 5 + Micronaut BOM to shared bom-conventions plugin; remove duplicated publication/constraints logic.
grails-bom/default/build.gradle	Switch default BOM to shared bom-conventions plugin; remove duplicated publication/constraints logic.
grails-bom/base/build.gradle	Switch base BOM to shared bom-conventions plugin; remove duplicated publication/constraints logic.
dependencies.gradle	Extract Groovy module dependency map generation into a helper and simplify override branching.
build-logic/plugins/src/main/groovy/org/apache/grails/buildsrc/BomConventionsPlugin.groovy	New shared BOM conventions plugin implementing extracted common logic.
build-logic/plugins/build.gradle	Register the new plugin and add required module dependency for BOM task classes.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.3636%. Comparing base (05393b3) to head (23714e7).

Additional details and impacted files

@@                Coverage Diff                 @@
##                8.0.x     #15827        +/-   ##
==================================================
+ Coverage     49.3625%   49.3636%   +0.0011%     
- Complexity      16777      16778         +1     
==================================================
  Files            1986       1986                
  Lines           93336      93336                
  Branches        16337      16337                
==================================================
+ Hits            46073      46074         +1     
- Misses          40134      40136         +2     
+ Partials         7129       7126         -3     

see 5 files with indirect coverage changes

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[testlens-app]

✅ All tests passed ✅

🏷️ Commit: 23714e7
▶️ Tests: 6611 executed
⚪️ Checks: 59/59 completed

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