I was trying to create a node js deployment to an Azure web app resource. However, AzureWebApp@1 does not deploy the zip file to the correct location, it just tells me it was successful.
my yaml file looks like this:

trigger:
- master

stages:
- stage:
  displayName: 'Dev Environment'
  jobs:
  - deployment: deploy_dev
    displayName: Deploy to 'Dev
    pool:
      vmImage: 'ubuntu-latest'
    environment: 'env-dev'
    strategy:
      runOnce:
        deploy:
          steps:
            - checkout: self
            - script: |
                cd $(Build.SourcesDirectory)
                pwd
                ls
              displayName: show directory
            - script: npm install
              displayName: 'Install dependencies'
            - task: Npm@1
              inputs:
                command: 'custom'
                customCommand: 'run build'
            - task: ArchiveFiles@2
              inputs:
                rootFolderOrFile: '$(System.DefaultWorkingDirectory)/build'
                includeRootFolder: false
                archiveType: 'zip'
                archiveFile: '$(Build.ArtifactStagingDirectory)/$(Build.BuildId).zip'
                replaceExistingArchive: true
            - task: PublishBuildArtifacts@1
              inputs:
                PathtoPublish: $(Build.ArtifactStagingDirectory)/$(Build.BuildId).zip
            - script: |
                unzip -l $(Build.ArtifactStagingDirectory)/$(Build.BuildId).zip
            - task: AzureWebApp@1
              inputs:
                azureSubscription: <subscription>
                appType: 'webAppLinux'
                appName: <appname>
                package: '$(Build.ArtifactStagingDirectory)/$(Build.BuildId).zip'

I added some extra logging just for my sanity. All the right files are found within the zip file. When I download the artifact, it too contains all the correct files:

but once I go and check in the kudolite bash and enter into the site/wwwroot those files are nowhere to be found.

These appear to be just the default files for the default page Microsoft loads when a user creates a Linux node web app.
but yet AzureWebApp@1 claims to be successful. So something odd is happening, or I’m missing something obvious.