Put this script in a `PowerShell` task in your Azure Pipelines YAML and the `PowerShell` task will use the daily build of PowerShell!

azure-pipelines-style.yml

steps:
  - powershell: |
      Write-Host "Installing PowerShell Daily..."

      # Use `AGENT_TEMPDIRECTORY` to make sure the downloaded PowerShell is cleaned up.
      $powerShellPath = Join-Path -Path $env:AGENT_TEMPDIRECTORY -ChildPath 'powershell'
      Invoke-WebRequest -Uri https://aka.ms/install-powershell.ps1 -OutFile ./install-powershell.ps1

      ./install-powershell.ps1 -Destination $powerShellPath -Daily

      # Using `prependpath` to update the PATH just for this build.
      Write-Host "##vso[task.prependpath]$powerShellPath"
    displayName: Install PowerShell Daily
  - pwsh: '$PSVersionTable'
    displayName: Display PowerShell version information

install-powershell-daily.ps1

Write-Host "Installing PowerShell Daily..."

# Use `AGENT_TEMPDIRECTORY` to make sure the downloaded PowerShell is cleaned up.
$powerShellPath = Join-Path -Path $env:AGENT_TEMPDIRECTORY -ChildPath 'powershell'
Invoke-WebRequest -Uri https://aka.ms/install-powershell.ps1 -OutFile ./install-powershell.ps1

./install-powershell.ps1 -Destination $powerShellPath -Daily

# Using `prependpath` to update the PATH just for this build.
Write-Host "##vso[task.prependpath]$powerShellPath"

Example PR can be found here:
PowerShell/PowerShellEditorServices#1252
and here:
PowerShell/vscode-powershell#2617