Environment variables cannot be passed to extension

Unable to provide a token stored as an environment variable to this extension (templater = dbt, dialect = databricks) :

The extension does not inherit environment variables defined by "terminal.integrated.env.osx" . DBT's vscode extension uses this. Ex:
```
  "terminal.integrated.env.osx": {
      "DATABRICKS_TOKEN": "${env:my_token}"
  }
```
The vscode settings for sqlfluff, specifically "sqlfluff.env.environmentVariables", don't seem to support pulling in environment variables. Ex:
```
  "sqlfluff.env.environmentVariables": [
      {
      "key": "DATABRICKS_TOKEN",
      "value": "${env:my_token}"
      }
  ],
```
Even using the "sqlfluff.env.useDotEnvFile": true does not work as intended using a .env file like below. Ex:
```
# .env
DATABRICKS_TOKEN=${my_token}
```

How can we configure the extension to inherit an environment variable in some way? (for obvious reasons I wouldn't want to hardcode a token in my settings.json)

sqlfluff / vscode-sqlfluff

Environment variables cannot be passed to extension #123