Ability to set site wide password via bicep or some other automatable means

**Is your feature request related to a problem? Please describe.**
I'm unable to find a way to set the basic site wide password when deploying site web app infrastructure via bicep. I have to go to the azure portal after deployment and manually set it there.

**Describe the solution you'd like**
I'd like some mechanism to configure the password as part of my devops pipeline. Either through bicep, azure cli or azure powershell. Or a way to specify a keyvault via one of those mechanisms to fetch a password from.
Alternatively setting it via some other automatable mechanism like environment variables or a setting file.

**Describe alternatives you've considered**
I could try defining authentication via AD for all routes, however this seems like overkill for a simple test environment and adds the complexity of managing access via roles. I haven't dug into this to see how easy/hard/impossible this might be to automate yet.

**Additional context**
I've checked bicep docs for `Microsoft.Web staticSites` and all sub resources and the `az staticwebapp` docs and haven't been able to find a way to do this. I also haven't found any documentation in `static-web-apps/authentication` or configuration documentation that indicates anyway to do this.

My use case is automated infrastructure as code deployment of test environments.