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Having upgraded to the latest LocalStack version, I've noticed that Docker containers from Lambda executions are immediately removed when they terminate.

This was added in https://github.com/localstack/localstack/pull/1584

I can appreciate the need to clean up containers, however this feature of having them stay up is actually very useful for debugging things when they go wrong!

Would it be possible to have a flag so that when running LocalStack we can specify whether to remove containers on completion? Something like:

```
services:
  localstack:
    image: localstack/localstack:latest
    ports:
      - "4567-4593:4567-4593"
    environment:
      - SERVICES=serverless,ssm,stepfunctions
      - DOCKER_HOST=unix:///var/run/docker.sock
      - LAMBDA_EXECUTOR=docker
      - REMOVE_CONTAINERS_ON_LAMBDA_TERMINATE=true #(or false)
    volumes:
      - "${TMPDIR:-/tmp/localstack}:/tmp/localstack"
      - "/var/run/docker.sock:/var/run/docker.sock"
```

Thanks for the great work folks!
if is_zip_file(zip_file_content):
        def execute(event, context):
            result, log_output = lambda_executors.EXECUTOR_LOCAL.execute_java_lambda(
                event, context, handler=handler, main_file=main_file)
            return result
        return execute, zip_file_content
    raise ClientError(error_response(
        'Unable to extract Java Lambda handler - file is not a valid zip/jar file', 400, error_type='ValidationError'))
def set_archive_code(code, lambda_name, zip_file_content=None):
    
    lambda_arn = func_arn(lambda_name)
    lambda_details = arn_to_lambda[lambda_arn]
    is_local_mount = code.get('S3Bucket') == BUCKET_MARKER_LOCAL
    if is_local_mount and config.LAMBDA_REMOTE_DOCKER:
        msg = 'Please note that Lambda mounts (bucket name "%s") cannot be used with LAMBDA_REMOTE_DOCKER=1'
        raise Exception(msg % BUCKET_MARKER_LOCAL)
    
    LAMBDA_EXECUTOR.cleanup(lambda_arn)
    if is_local_mount:
        
        
        
        
        return code['S3Key']
    
    zip_file_content = zip_file_content or get_zip_bytes(code)
    
    code_sha_256 = base64.standard_b64encode(hashlib.sha256(zip_file_content).digest())
    lambda_details.get_version('$LATEST')['CodeSize'] = len(zip_file_content)
    lambda_details.get_version('$LATEST')['CodeSha256'] = code_sha_256.decode('utf-8')