Add ojp-testcontainers integration test and CI job

[Copilot]

The ojp-testcontainers module had no integration test and was never exercised in CI, meaning changes to OjpContainer could silently break without detection.

Changes

• New OjpContainerIntegrationTest — single integration test gated by -DenableOjpContainerTests=true; starts an OjpContainer, asserts isRunning(), verifies TCP connectivity on the mapped OJP port, and validates getOjpConnectionString() output:

@EnabledIf("org.openjproxy.testcontainers.OjpContainerIntegrationTest#isEnabled")
class OjpContainerIntegrationTest {
    static boolean isEnabled() {
        return Boolean.parseBoolean(System.getProperty("enableOjpContainerTests", "false"));
    }

    @Test
    void testContainerStartsAndIsReachable() throws IOException {
        try (OjpContainer container = new OjpContainer()) {
            container.start();
            assertTrue(container.isRunning());
            try (Socket socket = new Socket()) {
                socket.connect(new InetSocketAddress(container.getOjpHost(), container.getOjpPort()), 5_000);
                assertTrue(socket.isConnected());
            }
            assertEquals(container.getOjpHost() + ":" + container.getOjpPort(),
                         container.getOjpConnectionString());
        }
    }
}

• OjpContainerTest — guard Docker-starting tests — testStartAndGetConnectionInfo and testContainerIsReady now carry the same @EnabledIf annotation so mvn test no longer pulls Docker images unconditionally.

• New ojp-testcontainers-test CI job — runs after build-test, installs the module from local source first (ensuring latest code), then runs the integration test:

- name: Build and Install (ojp-testcontainers) locally
  run: mvn clean install -pl ojp-testcontainers -am -DskipTests -Dgpg.skip=true

- name: Run OJP TestContainers Integration Tests
  run: mvn test -pl ojp-testcontainers -Dgpg.skip=true -DenableOjpContainerTests=true

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[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