### 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
```



MAX_ENV_ARGS_LENGTH = 20000
    @classmethod
    def create_env_vars_file_flag(cls, env_vars: Dict) -> Tuple[List[str], Optional[str]]:
        if not env_vars:
            return [], None
        result = []
        env_vars = dict(env_vars)
        env_file = None
        if len(str(env_vars)) > cls.MAX_ENV_ARGS_LENGTH:
            
            env_file = cls.mountable_tmp_file()
            env_content = ""
            for name, value in dict(env_vars).items():
                if len(value) > cls.MAX_ENV_ARGS_LENGTH:
                    
                    continue
                env_vars.pop(name)
                value = value.replace("\n", "\\")
                env_content += "%s=%s\n" % (name, value)
            save_file(env_file, env_content)
            result += ["--env-file", env_file]
        env_vars_res = [item for k, v in env_vars.items() for item in ["-e", "{}={}".format(k, v)]]
        result += env_vars_res
        return result, env_file
    @staticmethod
    def rm_env_vars_file(env_vars_file) -> None: