定期実行するLambdaをAWS CDKでデプロイする(Docker imageを使用)

npm install -g aws-cdk
cdk bootstrap

from aws_cdk import (
    aws_events as events,
    aws_lambda as lambda_,
    aws_iam as aws_iam,
    aws_events_targets as targets,
    Duration,
    Stack,
)
from constructs import Construct
import os
from dotenv import load_dotenv

load_dotenv()

class FooStack(Stack):
    def __init__(self, scope: Construct, construct_id: str, **kwargs) -> None:
        super().__init__(scope, construct_id, **kwargs)
        # 1. IAM poloicy (for Lambda Function)
        lambdaRole = aws_iam.Role(
            self,
            "lambdaRole",
            role_name="foo-lambda-role",
assumed_by=aws_iam.ServicePrincipal("lambda.amazonaws.com"),
        )
     lambdaRole.add_managed_policy(aws_iam.ManagedPolicy.from_aws_managed_policy_name("AWSLambdaExecute"))
        lambdaRole.add_managed_policy(
            aws_iam.ManagedPolicy.from_aws_managed_policy_name("追加したいManagedのRoleがあれば")
        )
        # 2. lambda configuration
        lambdaFn = lambda_.DockerImageFunction(
            self,
            "FooFunction",  # リソース名
            timeout=Duration.seconds(300),
            code=lambda_.DockerImageCode.from_image_asset("lambda/"),
            role=lambdaRole,
            retry_attempts=0,
            environment={
                "Foo": os.environ["Foo"],
                "Bar": os.environ["Bar"],
            },
        )
        # 3. cron configuration
        rule = events.Rule(
            self,
            "Rule",
            schedule=events.Schedule.cron(minute="0", hour="*/8", month="*", week_day="MON-FRI", year="*"),
        )
        rule.add_target(targets.LambdaFunction(lambdaFn))

FROM public.ecr.aws/lambda/python:3.8

COPY requirements.txt ${LAMBDA_TASK_ROOT}
RUN  pip3 install -r requirements.txt --target "${LAMBDA_TASK_ROOT}" && yum install -y nmap
COPY . ${LAMBDA_TASK_ROOT}

CMD [ "foo.handler" ] 

.
├── app.py
├── lambda
│   ├── Dockerfile
│   ├── foo.py # lambdaで実行したいコード
│   ├── requirements.txt # 使用するライブラリ
├── foo
│   ├── __init__.py
│   └── foo_stack.py

cd lambda
pip install -r requirements.txt -t ./python
zip -r layer.zip python/

Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?