Extend task to support single revision with suffix

Hi,

It would be great to support scenario, where single revision is used for the Azure Container App. In this case we could specify the "revisionSuffix" together with the image from the Azure Container Registry, here is example:

```
- task: AzureContainerApps@0
displayName: Build and deploy Container App
inputs:
connectedServiceNameARM: connection-to-azure
acrName: 'acrazure'
containerAppName: 'test-aca'
imageToBuild: 'mytestacr.azurecr.io/app:latest'
revisionSuffix: $(Build.BuildId)
```

This would enable scenario where we can define revision suffix and also indicate which Docker image to use from the container registry.