Missing bicep option in the az-cli for template specs

[kopendrex]

Is your feature request related to a problem? Please describe.
In this moment az-cli deploy template specs works only with ARM Templates.

Describe the solution you'd like
Workaround is create json with bicep but the correct way az ts create should working with bicep files directly.

[anthony-c-martin]

Fixed with Azure/azure-cli#18888