### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

this is my docker-config.yml
```

localstack:
    image: localstack/localstack:latest
    restart : always
    environment:
      - AWS_DEFAULT_REGION=eu-central-1
      - SERVICES=neptune,route53,events,stepfunctions,kinesis,cloudtrail,ses,elbv2,es,ec2,secretsmanager,firehose,ecs,ecr,sns,sqs,appsync,edge,cognito,lambda,s3,docdb,apigateway,apigatewayv2,cloudformation,sts,iam,dynamodb:4701,cloudfront
      - START_WEB=0
      - DEBUG=1
      - NODE_TLS_REJECT_UNAUTHORIZED=0
      - DISABLE_EVENTS=true
      - TEST_AWS_ACCOUNT_ID=123456789012
      - LAMBDA_EXECUTOR=docker-reuse
      - HOSTNAME_EXTERNAL=localstack
      - LAMBDA_DOCKER_NETWORK=localstack_default
      - LAMBDA_REMOTE_DOCKER=true
      - LAMBDA_REMOVE_CONTAINERS=false
      - DATA_DIR=/tmp/localstack/data
      - HOST_TMP_FOLDER=/tmp/localstack
      - LOCALSTACK_API_KEY=xxxxxxxxxx
      - DOCKER_HOST=unix:///var/run/docker.sock
      - DYNAMODB_PORT_EXTERNAL=4701
      - HOSTNAME_EXTERNAL=localstack
      - LAMBDA_DOCKER_DNS=8.8.8.8
 ```

the  lambda container cannot comunicate with external service, but only with service inside docker network named localstack_default




### Expected Behavior

lambda container can comunicate with external service

### How are you starting LocalStack?

Custom (please describe below)

### Steps To Reproduce

executing this py script inside lambda container 

```
import requests
print (requests.get('https://ifconfig.co/json’).text)

```

i got " [Errno -3] Temporary failure in name resolution'"

work replacing the idfconfig.co with ip addess



### Environment

```markdown
- OS: debian 11
- LocalStack: 0.12.17 or latest
```


### Anything else?

the /etc/hosts file  into the lambda container started from localstack:0.12.17
```

127.0.0.1	localhost
::1	localhost ip6-localhost ip6-loopback
fe00::0	ip6-localnet
ff00::0	ip6-mcastprefix
ff02::1	ip6-allnodes
ff02::2	ip6-allrouters
172.18.0.4	77c41d53db2b
172.17.0.1 localhost.localstack.cloud

```

the /etc/hosts file  into the lambda container started from localstack:0.12.16

```
127.0.0.1	localhost
::1	localhost ip6-localhost ip6-loopback
fe00::0	ip6-localnet
ff00::0	ip6-mcastprefix
ff02::1	ip6-allnodes
ff02::2	ip6-allrouters
172.18.0.3	8e545993dcf9
172.18.0.8 localhost.localstack.cloud
```



additional_flags = "--add-host sometest.localstack.cloud:127.0.0.1"
        stdout, _ = docker_client.run_container(
            "alpine",
            remove=True,
            command=["getent", "hosts", "sometest.localstack.cloud"],
            additional_flags=additional_flags,
        )
        stdout = stdout.decode(config.DEFAULT_ENCODING)
        assert "127.0.0.1" in stdout
        assert "sometest.localstack.cloud" in stdout
    def test_get_container_ip_non_existing_container(self, docker_client: ContainerClient):
        with pytest.raises(NoSuchContainer):
            docker_client.get_container_ip("hopefully_non_existent_container_%s" % short_uid())
    def test_get_container_ip(self, docker_client: ContainerClient, dummy_container):
        docker_client.start_container(dummy_container.container_id)
        ip = docker_client.get_container_ip(dummy_container.container_id)
        assert re.match(
            r"^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$",
            ip,
        )
        assert "127.0.0.1" != ip