### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

The documentation states that when setting DYNAMODB_SHARE_DB=1 DynamodDB will use a single database for each credential and region. This doesn't work when LocalStack is started from CLI. For example:

`DYNAMODB_SHARE_DB=1 localstack start -d`

In Docker logs you can find:
INFO:localstack.services.dynamodb.server: SharedDb:     false

At least it seems that the environment variable is missing from CONFIG_ENV_VARS which is used for passing the environment variables to container.

Tried the following fix and at least after brief testing it solves the issue:
https://github.com/jvuori/localstack/commit/6bb4a3c68c8675b9548e0f5eb8028397d9ee5a47
Feel free to pull if the fix is appropriate. (Sorry, no unit test...)

### Expected Behavior

`DYNAMODB_SHARE_DB=1 localstack start -d`
should start DynamoDB with:

INFO:localstack.services.dynamodb.server: SharedDb:     true

### How are you starting LocalStack?

With the `localstack` script

### Steps To Reproduce

#### How are you starting localstack (e.g., `bin/localstack` command, arguments, or `docker-compose.yml`)

DYNAMODB_SHARE_DB=1 localstack start -d


### Environment

```markdown
- OS: Windows + WSL2 + Docker CE running inside WSL2
- LocalStack: 0.14.1
```


### Anything else?

_No response_
host = host or HOSTNAME_EXTERNAL
    port = port or service_port(service_key, external=True)
    return service_url(service_key, host=host, port=port)
def get_edge_port_http():
    return EDGE_PORT_HTTP or EDGE_PORT
def get_edge_url(localstack_hostname=None, protocol=None):
    port = get_edge_port_http()
    protocol = protocol or get_protocol()
    localstack_hostname = localstack_hostname or LOCALSTACK_HOSTNAME
    return "%s://%s:%s" % (protocol, localstack_hostname, port)
def edge_ports_info():
    if EDGE_PORT_HTTP:
        result = "ports %s/%s" % (EDGE_PORT, EDGE_PORT_HTTP)
    else:
        result = "port %s" % EDGE_PORT
    result = "%s %s" % (get_protocol(), result)
    return result
if DEBUG:
    logging.getLogger("").setLevel(logging.DEBUG)
    logging.getLogger("localstack").setLevel(logging.DEBUG)
if LS_LOG in TRACE_LOG_LEVELS:
    load_end_time = time.time()
    LOG = logging.getLogger(__name__)
    LOG.debug(
        "Initializing the configuration took %s ms", int((load_end_time - load_start_time) * 1000)
    )
class ServiceProviderConfig(Mapping[str, str]):