Static angular site Azure DevOps pipeline Static web site deploy to Azure blob GPv2. Define variables (jsonpath) for file transform

build.yml

pool:
  vmImage: Hosted Ubuntu 1604
  demands: npm

steps:
- task: Npm@1
  displayName: 'npm install'
  inputs:
    verbose: false

- task: Npm@1
  displayName: 'npm run'
  inputs:
    command: custom
    verbose: false
    customCommand: 'run build:prod'

- task: CopyFiles@2
  displayName: 'Copy Files to: $(build.artifactstagingdirectory)'
  inputs:
    SourceFolder: dist
    TargetFolder: '$(build.artifactstagingdirectory)'

- task: PublishBuildArtifacts@1
  displayName: 'Publish Artifact: drop'

release.yml

steps:
- task: FileTransform@1
  displayName: 'File Transform: '
  inputs:
    folderPath: '$(System.DefaultWorkingDirectory)/_<buildname>/drop'
    fileType: json
    targetFiles: '**/appConfig.json'

- task: AzureFileCopy@3
  displayName: 'AzureBlob File Copy'
  inputs:
    SourcePath: '$(System.DefaultWorkingDirectory)/_<buildname>/drop'
    azureSubscription: '<subscription name>'
    Destination: AzureBlob
    storage: <storageaccountname>
    ContainerName: '$web'