Add Maven CI workflow for main with enforced JaCoCo coverage

[Copilot]

This adds a GitHub Actions workflow for Maven on push and pull_request targeting main. The pipeline now compiles the backend, runs unit tests, and enforces JaCoCo coverage at a minimum threshold of 70%.

• CI workflow

  • adds .github/workflows/maven.yml
  • triggers on:
    • push to main
    • pull_request to main
  • runs on ubuntu-latest
  • uses Temurin JDK 21 with Maven dependency caching
  • defines explicit read-only token permissions

• Build and verification flow

  • separates the pipeline into:
    • compile (./mvnw -B -DskipTests compile)
    • unit tests (./mvnw -B test)
    • verification / quality gate (./mvnw -B verify)

• Coverage gate

  • updates the Maven JaCoCo configuration to enforce a minimum coverage ratio of 0.70
  • binds the JaCoCo check execution to verify so the threshold is enforced consistently in CI

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]

permissions:
  contents: read

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud