CAMEL-23274: Add incremental coverage to SonarCloud PR analysis

Build on top of the core coverage from the base PR by adding
per-module coverage for PR-affected components using the
incremental-build action.

Changes:
- parent/pom.xml: Add jacoco:report goal to coverage profile so each
  tested module generates its own XML report at
  target/site/jacoco/jacoco.xml
- pom.xml: Update sonar.coverage.jacoco.xmlReportPaths to include
  both per-module reports and the aggregated core report
- sonar-build.yml: Add incremental-build step with -Dcoverage in
  MVND_OPTS to test PR-affected modules with JaCoCo
- coverage/pom.xml: Add ContextValueFactory to MRJAR excludes

Coverage strategy:
- Core: aggregated report via coverage module (camel-core tests
  exercise classes across multiple core source modules)
- Components: per-module reports (each component has its own
  classes and tests)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: gnodet

.github/workflows/sonar-build.yml

@@ -58,6 +58,27 @@ jobs:
       - name: Build with Maven
         run: ./mvnw install -B -Dquickly
 
+      # Run core tests with JaCoCo and generate aggregated coverage report.
+      # Core modules need the aggregated report because camel-core tests
+      # exercise classes from camel-core-model, camel-core-processor, etc.
+      - name: Run core tests with coverage
+        run: >
+          ./mvnw verify -B -Dcoverage
+          -pl core/camel-api,core/camel-util,core/camel-support,core/camel-management-api,core/camel-management,core/camel-base,core/camel-base-engine,core/camel-core-engine,core/camel-core-languages,core/camel-core-model,core/camel-core-processor,core/camel-core-reifier,core/camel-core,coverage
+          -Dmaven.test.failure.ignore=true
+
+      # Run tests on PR-affected modules with JaCoCo coverage.
+      # Each component module generates its own per-module report
+      # (target/site/jacoco/jacoco.xml) covering its own classes.
+      - name: Run incremental tests with coverage
+        uses: ./.github/actions/incremental-build
+        with:
+          pr-id: ${{ github.event.pull_request.number }}
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          artifact-upload-suffix: sonar
+        env:
+          MVND_OPTS: "-Dcoverage -Dmaven.test.failure.ignore=true"
+
       - name: Prepare compiled classes artifact
         shell: bash
         run: find . -name "target" -type d | tar -czf target.tar.gz -T -

coverage/pom.xml

@@ -2650,6 +2650,7 @@
                                     <!-- Workaround to multi-release jar https://github.com/jacoco/jacoco/issues/407 -->
                                     <excludes>
                                         <exclude>**/CamelThreadFactory*</exclude>
+                                        <exclude>**/ContextValueFactory*</exclude>
                                     </excludes>
                                 </configuration>
                             </execution>

parent/pom.xml

@@ -4496,6 +4496,13 @@
                                     </excludes>
                                 </configuration>
                             </execution>
+                            <execution>
+                                <id>report</id>
+                                <phase>verify</phase>
+                                <goals>
+                                    <goal>report</goal>
+                                </goals>
+                            </execution>
                         </executions>
                     </plugin>
                     <plugin>

pom.xml

@@ -121,9 +121,10 @@
         <project.build.outputTimestamp>2026-02-17T16:11:10Z</project.build.outputTimestamp>
 
         <!-- NOTE: this is required to correctly map each module coverage in Sonarqube. The ${maven.multiModuleProjectDirectory} may require some change
-            when upgrading to Maven 4.x, according to any of the new variables that will replace this one. -->
+            when upgrading to Maven 4.x, according to any of the new variables that will replace this one.
+            Two sources: per-module reports (from jacoco:report) and the aggregated report (from coverage module). -->
         <sonar.coverage.jacoco.xmlReportPaths>
-            ${maven.multiModuleProjectDirectory}/coverage/target/site/jacoco-aggregate/jacoco.xml
+            ${project.build.directory}/site/jacoco/jacoco.xml,${maven.multiModuleProjectDirectory}/coverage/target/site/jacoco-aggregate/jacoco.xml
         </sonar.coverage.jacoco.xmlReportPaths>
 
         <cyclonedx-maven-plugin-version>2.9.1</cyclonedx-maven-plugin-version>