CLI not working due to an unconfigured mock

[basilfx]

Describe the issue

Object reference not set to an instance of an object.
   at Microsoft.Azure.WebJobs.Extensions.OpenApi.Document.Build(Assembly assembly, OpenApiVersionType version) in azure-functions-openapi-extension/src/Microsoft.Azure.WebJobs.Extensions.OpenApi/Document.cs:line 137
   at Microsoft.Azure.WebJobs.Extensions.OpenApi.Document.Build(String assemblyPath, OpenApiVersionType version) in azure-functions-openapi-extension/src/Microsoft.Azure.WebJobs.Extensions.OpenApi/Document.cs:line 124
   at Microsoft.Azure.WebJobs.Extensions.OpenApi.CLI.Program.Generate(String project, String configuration, String target, OpenApiVersionType version, OpenApiFormatType format, String output, Boolean console) in azure-functions-openapi-extension/src/Microsoft.Azure.WebJobs.Extensions.OpenApi.CLI/Program.cs:line 90

A Mock is constructed for req without providing a getter for req.Query. It fails eventually when it executes this._req.Query["tags"].

To Reproduce

1. Have a working project (i.e. the web interface works)
2. Run the CLI (e.g. -p ../My.Project -v v3 -f yaml -t netcoreapp3.1 --console
3. Observe it fails

Expected behavior
It generates a Swagger specification.

Screenshots
N/a

Environment (please complete the following information, if applicable):

• OS: macOS 12.0.1
• .NET SDK 5.0.402
• 0.9.0-preview (from source)

Additional context
N/a

[justinyoo]

As the PR, #489, has been merged, you can generate the OpenAPI doc on-the-fly, within the GitHub Actions workflow.