Add GitHub Actions CI/CD pipeline for treebase-core with PostgreSQL support

[Copilot]

Implements automated build and test pipeline for treebase-core module with JUnit test execution and PostgreSQL database integration.

Workflow Configuration

• Triggers: Push/PR to main/master/develop branches, manual dispatch
• Environment: Ubuntu latest, Java 8 (Temurin), Maven with dependency caching
• Security: Explicit minimal GITHUB_TOKEN permissions (contents:read, checks:write, pull-requests:write)
• Database: PostgreSQL 12 service container for test execution

Pipeline Steps

1. Set up PostgreSQL database service (treebasedb)
2. Configure database connection properties for tests
3. Build treebase-core module
4. Execute JUnit test suite with database connectivity
5. Publish test reports (always runs, even on test failure)

Implementation

Created .github/workflows/ci.yml:

PostgreSQL Service

services:
  postgres:
    image: postgres:12
    env:
      POSTGRES_DB: treebasedb
      POSTGRES_USER: treebase_user
      POSTGRES_PASSWORD: treebase_pass
    options: >-
      --health-cmd pg_isready
      --health-interval 10s
      --health-timeout 5s
      --health-retries 5
    ports:
      - 5432:5432

Database Configuration

- name: Configure database properties for tests
  run: |
    mkdir -p /tmp/mesquite
    cat > treebase-core/src/test/resources/jdbc.properties << EOF
    jdbc.driverClassName=org.postgresql.Driver
    jdbc.url=jdbc:postgresql://localhost:5432/treebasedb
    jdbc.username=treebase_user
    jdbc.password=treebase_pass
    mesquite.folder_dir=/tmp/mesquite
    EOF

Build and Test

- name: Build treebase-core
  run: mvn -B clean compile -f treebase-core/pom.xml
  
- name: Run tests
  run: mvn -B test -f treebase-core/pom.xml
  
- name: Publish Test Report
  uses: dorny/test-reporter@v1
  if: always()
  with:
    name: JUnit Test Results
    path: treebase-core/target/surefire-reports/*.xml
    reporter: java-junit

The workflow automatically provisions a PostgreSQL database and configures the JDBC properties required by the test suite, resolving the ${jdbc.driverClassName} configuration issue.

Original prompt

Implement a GitHub Actions CI/CD pipeline that builds and tests treebase-core, which already has junit tests in it.

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[rvosa]

@copilot many tests are failing because ${jdbc.driverClassName} is not defined. This project uses postgres as its database. Fix this problem accordingly.

[Copilot]

@copilot many tests are failing because ${jdbc.driverClassName} is not defined. This project uses postgres as its database. Fix this problem accordingly.

Fixed in commit c791c1f. The workflow now:

1. Sets up a PostgreSQL 12 service container with database treebasedb
2. Automatically creates jdbc.properties with the PostgreSQL driver configuration:
   • jdbc.driverClassName=org.postgresql.Driver
   • JDBC URL pointing to the containerized PostgreSQL instance
   • Test database credentials
3. Creates the mesquite directory required by tests

Tests will now have access to a functional PostgreSQL database during CI runs.