Default Github branch name in Deploy to Azure is incorrect

[SeaDude]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [X] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Minimal steps to reproduce

1. Create a new Resource Group
2. Create a new Azure Communication Service (ACS)
3. Get a toll-free phone number for the ACS
4. Create an App Service Plan to host the Azure Event Grid Viewer (AEGV)
   • Requires Windows OS
   • Select West US 2 region
   • Select F1 SKU
   • 
5. Click the Deploy to Azure button for the Azure Event Grid Viewer (AEGV)
6. Launch the AEGV web app to ensure its working
   • 
7. Create an Event Grid Subscription (EGSUB) for the ACS
   • On the ACS blade, click Events
   • + Event Subscription
   • Name: eg-sub-<project>-eg-viewer
   • Event Schema: Event Grid Schema
   • System Topic Name: eg-sys-topic-<project>-eg-viewer
   • Filter to Event Types:
     • SMS Received
     • SMS Delivery Report Received
   • Endpoint Type: Web Hook
   • Endpoint: https://appsvc-eg-viewer.azurewebsites.net/api/updates
8. Send an SMS to the ACS phone number.

Any log messages given by the failure

Expected/desired behavior

The above should generate an Event Grid message, but it will not.

OS and Version?

Windows 10 PRO

Versions

Mention any other details that might be useful

• The problem is the default Github branch naming convention. Should be main, not master.
• This caused me pain (my own fault!) so I'm guessing it causes others pain too

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