Kudu utility PowerShell functions - https://jeffdarchuk.com/2019/03/12/remotely-triggering-sitecore-operations-in-azure/

Get-KuduUtility.ps1

function Get-AzureRmWebAppPublishingCredentials($resourceGroupName, $webAppName, $slotName = $null){
    if ([string]::IsNullOrWhiteSpace($slotName) -or $slotName.ToLower() -eq "production"){
        $resourceType = "Microsoft.Web/sites/config"
        $resourceName = "$webAppName/publishingcredentials"
    }
    else{
        $resourceType = "Microsoft.Web/sites/slots/config"
        $resourceName = "$webAppName/$slotName/publishingcredentials"
    }
    $publishingCredentials = Invoke-AzureRmResourceAction -ResourceGroupName $resourceGroupName -ResourceType $resourceType -ResourceName $resourceName -Action list -ApiVersion 2015-08-01 -Force
        return $publishingCredentials
}
 
function Get-KuduApiAuthorisationHeaderValue($resourceGroupName, $webAppName, $slotName = $null){
    $publishingCredentials = Get-AzureRmWebAppPublishingCredentials $resourceGroupName $webAppName $slotName
    $ret = @{}
    $ret.header = ("Basic {0}" -f [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes(("{0}:{1}" -f $publishingCredentials.Properties.PublishingUserName, $publishingCredentials.Properties.PublishingPassword))))
    $ret.url = $publishingCredentials.Properties.scmUri
    return $ret
}
 
function Get-FileFromWebApp($resourceGroupName, $webAppName, $slotName = "", $kuduPath){
    $KuduAuth = Get-KuduApiAuthorisationHeaderValue $resourceGroupName $webAppName $slotName
    $kuduApiAuthorisationToken = $KuduAuth.header
    $kuduApiUrl = $KuduAuth.url + "/api/vfs/site/wwwroot/$kuduPath"
 
    Write-Host " Downloading File from WebApp. Source: '$kuduApiUrl'." -ForegroundColor DarkGray
    $tmpPath = "$($env:TEMP)\$([guid]::NewGuid()).xml"
    $null = Invoke-RestMethod -Uri $kuduApiUrl `
                        -Headers @{"Authorization"=$kuduApiAuthorisationToken;"If-Match"="*"} `
                        -Method GET `
                        -ContentType "multipart/form-data" `
                        -OutFile $tmpPath
    $ret = Get-Content $tmpPath | Out-String
    Remove-Item $tmpPath -Force
    return $ret
}
 
function Write-FileToWebApp($resourceGroupName, $webAppName, $slotName = "", $fileContent, $kuduPath){
    $KuduAuth = Get-KuduApiAuthorisationHeaderValue $resourceGroupName $webAppName $slotName
    $kuduApiAuthorisationToken = $KuduAuth.header
    $kuduApiUrl = $KuduAuth.url + "/api/vfs/site/wwwroot/$kuduPath"
 
    Write-Host " Writing File to WebApp. Destination: '$kuduApiUrl'." -ForegroundColor DarkGray
 
    Invoke-RestMethod -Uri $kuduApiUrl `
                        -Headers @{"Authorization"=$kuduApiAuthorisationToken;"If-Match"="*"} `
                        -Method Put `
                        -ContentType "multipart/form-data"`
                        -Body $fileContent
}
function Write-FileFromPathToWebApp($resourceGroupName, $webAppName, $slotName = "", $filePath, $kuduPath){
    $KuduAuth = Get-KuduApiAuthorisationHeaderValue $resourceGroupName $webAppName $slotName
    $kuduApiAuthorisationToken = $KuduAuth.header
    $kuduApiUrl = $KuduAuth.url + "/api/vfs/site/wwwroot/$kuduPath"
 
    Write-Host " Writing File to WebApp. Destination: '$kuduApiUrl'." -ForegroundColor DarkGray
 
    Invoke-RestMethod -Uri $kuduApiUrl `
                        -Headers @{"Authorization"=$kuduApiAuthorisationToken;"If-Match"="*"} `
                        -Method Put `
                        -ContentType "multipart/form-data"`
                        -InFile $filePath
}
 
function Write-ZipToWebApp($resourceGroupName, $webAppName, $slotName = "", $zipFile, $kuduPath){
    $KuduAuth = Get-KuduApiAuthorisationHeaderValue $resourceGroupName $webAppName $slotName
    $kuduApiAuthorisationToken = $KuduAuth.header
    $kuduApiUrl = $KuduAuth.url + "/api/zip/site/wwwroot/$kuduPath"
 
    Write-Host " Writing Zip to WebApp. Destination: '$kuduApiUrl'." -ForegroundColor DarkGray
 
    Invoke-RestMethod -Uri $kuduApiUrl `
                        -Headers @{"Authorization"=$kuduApiAuthorisationToken;"If-Match"="*"} `
                        -Method Put `
                        -ContentType "multipart/form-data"`
                        -InFile $zipFile
}
function Remove-FileFromWebApp($resourceGroupName, $webAppName, $slotName = "", $kuduPath){
    $KuduAuth = Get-KuduApiAuthorisationHeaderValue $resourceGroupName $webAppName $slotName
    $kuduApiAuthorisationToken = $KuduAuth.header
    $kuduApiUrl = $KuduAuth.url + "/api/vfs/site/wwwroot/$kuduPath"
 
    Write-Host " Writing File to WebApp. Destination: '$kuduApiUrl'." -ForegroundColor DarkGray
 
    Invoke-RestMethod -Uri $kuduApiUrl `
                        -Headers @{"Authorization"=$kuduApiAuthorisationToken;"If-Match"="*"} `
                        -Method Delete `
                        -ContentType "multipart/form-data"
}