setup coverate report generation

docker-compose.test.yml

@@ -12,6 +12,8 @@ services:
       # Mount source for live testing during development
       - ./src:/app/src:ro
       - ./pom.xml:/app/pom.xml:ro
+      # Mount target directory to access test reports and coverage on host
+      - ./target:/app/target
       # Mount Maven cache to speed up subsequent test runs
       - maven-cache:/root/.m2
     command: mvn test