Deploy using parameters

deploy.ps1

# Get password from key vault
$secret = Get-AzureKeyVaultSecret -VaultName $VaultName -Name $VaultSecretName

# Create additional parameters that we pass to the template deployment
$additionalParameters = New-Object -TypeName hashtable
$additionalParameters['adminUsername'] = $AdminUsername
$additionalParameters['adminPassword'] = $secret.SecretValue

$result = New-AzureRmResourceGroupDeployment `
    -ResourceGroupName $ResourceGroupName `
    -TemplateFile $Template `
    -TemplateParameterFile $TemplateParameters `
    @additionalParameters `
    -Verbose