Create a pull request environment - Azure - azure

Question

I would want to create a pull request environment in Azure which gets deployed when a pull request is opened. Users can play around in that environment and find bugs. Once the bugs are fixed, and the PR is closed, I would want to delete that environment.
I am following through Sam Learns Azure and I was able to go through most steps, but its all .NET related.
Does anyone have an idea to do the same for a react-app?
I am also in favor of creating a new slot inside the app-service.
This is my modified code:
jobs:
- deployment: DeployWebServiceApp
displayName: "Deploy webservice app"
environment: ${{parameters.environment}}
pool:
vmImage: ubuntu-latest
strategy:
runOnce:
deploy:
steps:
- task: DownloadPipelineArtifact#2
displayName: 'Download Pipeline Artifacts'
inputs:
artifactName: "$(Build.BuildId)"
buildType: 'current'
- task: AzureCLI#2
displayName: 'Deploy infrastructure with ARM templates'
inputs:
azureSubscription: "${{parameters.serviceConnection}}"
scriptType: bash
scriptLocation: inlineScript
inlineScript: az webapp deployment slot create --name ui-dev-$(prLC)
--resource-group rg-dev
--slot $(prLC)
--configuration-source app-dev
- task: AzureRmWebAppDeployment#3
displayName: 'Azure App Service Deploy: web service'
inputs:
azureSubscription: "${{parameters.serviceConnection}}"
appName: "${{parameters.appServiceName}}"
DeployToSlotFlag: true
ResourceGroupName: '${{parameters.resourceGroupName}}'
package: '$(Pipeline.Workspace)/drop/$(Build.BuildId).zip'
RemoveAdditionalFilesFlag: true
TakeAppOfflineFlag: true
RenameFilesFlag: true

Answer 1

Why Not. You can do that in below steps-
Create the Build Pipe which build your react app
In the build pipe set a VSTS var only when it is a PR. eg varPR = x
Create a Release pipe which deploys the app
Add one more task at the end of build pipe to call the release using webhook based on condition varPR = x.
Ref - Trigger azure pipeline via webhook?
The link you have shared is also cool that does the job same job in a single build pipe.