Change init command to ovverride client default name

src/ALZ/Private/Test-ALZGitRepository.ps1

@@ -14,7 +14,7 @@ function Test-ALZGitRepository {
     }
     $gitInit = Read-Host "Initialize the directory $alzEnvironmentDestination as a git repository? (y/n)"
     if ($gitInit -ieq "y"  -and $PSCmdlet.ShouldProcess("gitrepository", "initialize")) {
-        git init $alzEnvironmentDestination
+        git init $alzEnvironmentDestination -b main
         return $true
     }
     return $false