Mismatch between readme functionality and actually implemented functionality for arg 'buildArguments'

Error Details:

The readme lists the following argument as valid within the confines of a workflow.

buildArguments
No
A list of build arguments provided as KEY=VALUE pairings and are space-separated. If a Dockerfile has been provided or is discovered in the application source, each build argument will be passed to the docker build command via the --build-arg flag. If the Oryx++ builder is used to create a runnable application image, each build argument will be passed to the pack build command via the --env flag.

When I use the workflow file like below, the workflow is invalid. Upon examining the workflow action.yaml - this input is not even supported.

```
- name: Build and deploy Container App
uses: azure/container-apps-deploy-action@v1
with:
...
buildArguments: |
"IMAGE_SHA_ARG=${{ env.IMAGE_SHA }}"
```