No "latest" tag

Running the task does not push a "latest" tag with the image - is that possible?

I was using this command locally, which I believe would push both hash and latest tags:
```
az acr build --file Dockerfile --registry --image .
```
EDIT: Okay you have it in the documentation that you can set the `tag` to e.g. `latest`. I will do that for now.

Read the documentation section that describes setting the tag and compare it with the behavior reported for the GitHub Action. Confirm whether setting the tag to latest produces the expected image tag; the issue is resolved if the documented setting works or the discrepancy is clearly documented.

Written by the indexing model from the issue text.