test-infra: Fix Docker container name collisions in parallel execution

- Append PID + AtomicInteger counter to container names in
  ContainerEnvironmentUtil.containerName() for cross-JVM (mvnd) and
  within-JVM (parallel test classes) uniqueness
- Skip the suffix when camel.infra.fixedPort=true (camel infra run)
  to preserve clean names like camel-postgres for docker exec usability
- Remove hardcoded withName("nameserver") from RocketMQNameserverContainer
  that bypassed ContainerEnvironmentUtil (network alias is sufficient)

Author: gnodet

test-infra/camel-test-infra-common/src/main/java/org/apache/camel/test/infra/common/services/ContainerEnvironmentUtil.java

@@ -21,6 +21,7 @@
 import java.util.Arrays;
 import java.util.List;
 import java.util.Objects;
+import java.util.concurrent.atomic.AtomicInteger;
 
 import com.github.dockerjava.api.model.Version;
 import com.github.dockerjava.api.model.VersionComponent;
@@ -35,6 +36,7 @@ public final class ContainerEnvironmentUtil {
     public static final String INFRA_PORT_PROPERTY = "camel.infra.port";
     public static final String INFRA_FIXED_PORT_PROPERTY = "camel.infra.fixedPort";
     private static final Logger LOG = LoggerFactory.getLogger(ContainerEnvironmentUtil.class);
+    private static final AtomicInteger INSTANCE_COUNTER = new AtomicInteger(0);
 
     private static boolean dockerAvailable;
     private static boolean environmentCheckState;
@@ -114,6 +116,11 @@ public static String containerName(Class cls) {
             if (annotation.serviceImplementationAlias().length > 0) {
                 name += "-" + annotation.serviceImplementationAlias()[0];
             }
+            // In fixed port mode (camel infra run), use clean names for docker exec usability
+            // Otherwise, append PID + counter for cross-JVM and within-JVM uniqueness
+            if (!Boolean.parseBoolean(System.getProperty(INFRA_FIXED_PORT_PROPERTY, "false"))) {
+                name += "-" + ProcessHandle.current().pid() + "-" + INSTANCE_COUNTER.incrementAndGet();
+            }
         } else {
             LOG.warn("InfraService annotation not Found to determine container name alias.");
         }

test-infra/camel-test-infra-rocketmq/src/main/java/org/apache/camel/test/infra/rocketmq/services/RocketMQNameserverContainer.java

@@ -32,7 +32,6 @@ public RocketMQNameserverContainer(Network network) {
         addExposedPort(RocketMQProperties.ROCKETMQ_NAMESRV_PORT);
         withTmpFs(Collections.singletonMap("/home/rocketmq/logs", "rw"));
         withCommand("sh", "mqnamesrv");
-        withCreateContainerCmdModifier(cmd -> cmd.withName("nameserver"));
 
         waitingFor(Wait.forListeningPort());
     }