To write .yml file to deploy .net application in Azure Virtual Machine

Take this:

Folder Structure Suggestion:

/azure-pipelines
  ├── azure-pipelines.yml
  ├── templates/
  │   └── deploy-template.yml
  └── vars/
      ├── vars-dev.yml
      ├── vars-qa.yml
      ├── vars-uat.yml
      └── vars-prod.yml

Sample Variable Group Template (vars/vars-dev.yml)

variables:
  environmentName: 'Dev'
  webAppName: 'myapp-dev'
  vmGroup: 'vm-dev-group'
  configFilePath: 'Configs/web.dev.config'

Repeat similarly for QA, UAT, and Prod.

Main Pipeline (azure-pipelines.yml)

trigger:
  branches:
    include:
      - main

stages:
- stage: DeployDev
  displayName: 'Deploy to Dev'
  jobs:
  - template: templates/deploy-template.yml
    parameters:
      env: 'dev'
      variableFile: 'vars/vars-dev.yml'

- stage: DeployQA
  displayName: 'Deploy to QA'
  jobs:
  - template: templates/deploy-template.yml
    parameters:
      env: 'qa'
      variableFile: 'vars/vars-qa.yml'

Deployment Template (templates/deploy-template.yml)

parameters:
  env: ''
  variableFile: ''

jobs:
- job: DeployJob
  displayName: 'Deploy to ${{ parameters.env }}'
  variables:
    - template: ${{ parameters.variableFile }}
  steps:
    - task: AzureCLI@2
      inputs:
        azureSubscription: 'Your-Service-Connection'
        scriptType: 'pscore'
        scriptLocation: 'inlineScript'
        inlineScript: |
          Write-Host "Deploying to $env:environmentName"
          # Replace web.config based on environment
          Copy-Item $env:configFilePath -Destination '$(Build.ArtifactStagingDirectory)/web.config' -Force
          # Add your deployment logic here (e.g., Web Deploy, PowerShell Remoting)