### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

`PORTS_CHECK_DOCKER_IMAGE` is not configurable which prevents ECS tasks from running on air-gapped environment



### Expected Behavior

`PORTS_CHECK_DOCKER_IMAGE` can be configured via configuration option to allow use of any available image 

### How are you starting LocalStack?

With a docker-compose file

### Steps To Reproduce

Run an ECS task in an environment where localstack/localstack is not available.

### Environment

```markdown
- OS: RHEL8
- Docker runtime version: Podman v4.2.0
- LocalStack: 1.3.1
```


### Anything else?

_No response_
if LS_LOG:
        log_level = str(LS_LOG).upper()
        return log_level.lower() in TRACE_LOG_LEVELS
    return False
if DEBUG:
    logging.getLogger("").setLevel(logging.DEBUG)
    logging.getLogger("localstack").setLevel(logging.DEBUG)
LOG = logging.getLogger(__name__)
if is_trace_logging_enabled():
    load_end_time = time.time()
    LOG.debug(
        "Initializing the configuration took %s ms", int((load_end_time - load_start_time) * 1000)
    )
def parse_service_ports() -> Dict[str, int]:
    """Parses the environment variable $SERVICES with a comma-separated list of services
    and (optional) ports they should run on: 'service1:port1,service2,service3:port3'"""
    service_ports = os.environ.get("SERVICES", "").strip()
    if service_ports and not is_env_true("EAGER_SERVICE_LOADING"):
        LOG.warning("SERVICES variable is ignored if EAGER_SERVICE_LOADING=0.")
        service_ports = None  
    if not service_ports:
        return DEFAULT_SERVICE_PORTS
    result = {}
    for service_port in re.split(r"\s*,\s*", service_ports):
        parts = re.split(r"[:=]", service_port)
        service = parts[0]
        key_upper = service.upper().replace("-", "_")
        port_env_name = "%s_PORT" % key_upper
        
        port_number = DEFAULT_SERVICE_PORTS.get(service)