az webapp up flag for html static sites

[btardif]

There is no reliable detection logic for plain old html apps.

we should add a -html flag that ignores detection logic and deploys this as a html app.

See:

• https://github.com/MicrosoftDocs/azure-docs/issues/44124

[btardif]

@panchagnula can we add @ammanifold to this team so that I can assign stuff to her?

[yonzhan]

@ammanifold any update for this issue?

[ammanifold]

Waiting for the PR to be merged