### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

Starting localstack with the CLI `PROVIDER_OVERRIDE_SQS=asf bin/localstack --debug start` starts up correctly but then uses the `default` SQS provider.

### Expected Behavior

I would expect it to start the asf provider.

### How are you starting LocalStack?

With the `localstack` script

### Steps To Reproduce

* `PROVIDER_OVERRIDE_SQS=asf bin/localstack --debug start`
* `awslocal sqs create-queue --queue-name "test-queue"`

logs show:

```
2021-12-27T14:08:43.274:DEBUG:plugin.manager: instantiating plugin PluginSpec(localstack.aws.provider.sqs:default = <function sqs at 0x7f30e6d2b820>)
2021-12-27T14:08:43.274:DEBUG:plugin.manager: loading plugin localstack.aws.provider:sqs:default
2021-12-27T14:08:43.278:INFO:localstack.services.infra: Starting mock SQS service on http port 4566 ...
2021-12-27T14:08:43.279:INFO:localstack.services.infra: Starting mock SQS service on http port 4566 ...
2021-12-27T14:08:43.279:INFO:localstack.services.motoserver: starting moto server on http://0.0.0.0:38335
```

### Environment

```markdown
- OS: Ubuntu 20.04
- LocalStack: 13.2
```


### Anything else?

_No response_
),
                os.path.exists("/sys/fs/cgroup/docker/"),
                any(
                    "docker-" in file_names
                    for file_names in os.listdir("/sys/fs/cgroup/system.slice/")
                ),
            ]
        ):
            return False
    except Exception:
        pass
    with open("/proc/1/cgroup", "rt") as ifh:
        content = ifh.read()
        if "docker" in content:
            return True
        os_hostname = socket.gethostname()
        if os_hostname and os_hostname in content:
            return True
    return False
is_in_docker = in_docker()
is_in_linux = is_linux()
if not DOCKER_BRIDGE_IP:
    DOCKER_BRIDGE_IP = "172.17.0.1"
    if is_in_docker:
        candidates = (DOCKER_BRIDGE_IP, "172.18.0.1")
        for ip in candidates:
            if ping(ip):
                DOCKER_BRIDGE_IP = ip
                break
try: