### 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_
"ENABLE_CONFIG_UPDATES",
    "ES_CUSTOM_BACKEND",
    "ES_ENDPOINT_STRATEGY",
    "ES_MULTI_CLUSTER",
    "EXTRA_CORS_ALLOWED_HEADERS",
    "EXTRA_CORS_ALLOWED_ORIGINS",
    "EXTRA_CORS_EXPOSE_HEADERS",
    "HOSTNAME",
    "HOSTNAME_EXTERNAL",
    "HOSTNAME_FROM_LAMBDA",
    "KINESIS_ERROR_PROBABILITY",
    "KINESIS_INITIALIZE_STREAMS",
    "LAMBDA_CODE_EXTRACT_TIME",
    "LAMBDA_CONTAINER_REGISTRY",
    "LAMBDA_DOCKER_DNS",
    "LAMBDA_DOCKER_FLAGS",
    "LAMBDA_DOCKER_NETWORK",
    "LAMBDA_EXECUTOR",
    "LAMBDA_FALLBACK_URL",
    "LAMBDA_FORWARD_URL",
    "LAMBDA_JAVA_OPTS",
    "LAMBDA_REMOTE_DOCKER",
    "LAMBDA_REMOVE_CONTAINERS",
    "LAMBDA_STAY_OPEN_MODE",
    "LAMBDA_TRUNCATE_STDOUT",
    "LEGACY_DOCKER_CLIENT",
    "LOCALSTACK_API_KEY",
    "LOCALSTACK_HOSTNAME",
    "LOG_LICENSE_ISSUES",
    "LS_LOG",