updated exec perm for mi (#683)

Author: santhoshb-msft

deployment/Deploy.ps1

@@ -405,7 +405,7 @@ $dbaccesstoken = (Get-AzAccessToken -ResourceUrl https://database.windows.net).T
 Invoke-Sqlcmd -InputFile ./script.sql -ServerInstance $ServerUri -database $SQLDatabaseName -AccessToken $dbaccesstoken
 
 Write-host "      ➡️ Execute SQL script to Add WebApps"
-$AddAppsIdsToDB = "CREATE USER [$WebAppNameAdmin] FROM EXTERNAL PROVIDER;ALTER ROLE db_datareader ADD MEMBER  [$WebAppNameAdmin];ALTER ROLE db_datawriter ADD MEMBER  [$WebAppNameAdmin];CREATE USER [$WebAppNamePortal] FROM EXTERNAL PROVIDER;ALTER ROLE db_datareader ADD MEMBER [$WebAppNamePortal];ALTER ROLE db_datawriter ADD MEMBER [$WebAppNamePortal];"
+$AddAppsIdsToDB = "CREATE USER [$WebAppNameAdmin] FROM EXTERNAL PROVIDER;ALTER ROLE db_datareader ADD MEMBER  [$WebAppNameAdmin];ALTER ROLE db_datawriter ADD MEMBER  [$WebAppNameAdmin]; GRANT EXEC TO [$WebAppNameAdmin]; CREATE USER [$WebAppNamePortal] FROM EXTERNAL PROVIDER;ALTER ROLE db_datareader ADD MEMBER [$WebAppNamePortal];ALTER ROLE db_datawriter ADD MEMBER [$WebAppNamePortal]; GRANT EXEC TO [$WebAppNamePortal];"
 Invoke-Sqlcmd -Query $AddAppsIdsToDB -ServerInstance $ServerUri -database $SQLDatabaseName -AccessToken $dbaccesstoken
 
 Write-host "   🔵 Deploy Code to Admin Portal"