Remove need for a password when deploying container image from Azure Container Registry

**Is your feature request related to a problem? Please describe.**

When creating a new deployment, or updating a deployment, for a container image hosted within Azure Container Registry into Azure Spring Apps, a registry username and password must be passed in the az cli command line with the following parameters: --registry-username and --registry-password.

Reference: https://learn.microsoft.com/en-us/cli/azure/spring/app/deployment?view=azure-cli-latest#az-spring-app-deployment-create

We would like to avoid needing to use a password.

**Describe the solution you'd like**

Allow the use of a managed identity to connect to the container registry, or allow an access token to be passed similar to the ACR login command documented here - https://learn.microsoft.com/en-us/azure/container-registry/container-registry-authentication?tabs=azure-cli#az-acr-login-with---expose-token

**Describe alternatives you've considered**

There does not appear to be any other alternatives when running from the command line.

When running within a DevOps pipelines, store the password into Key Vault and setup the pipeline variables to read from Key Vault.

Though, this requires somebody to generate a password and put it into Key Vault.

**Describe the Customer Impact**

Would like to avoid the need for any password.

**Additional context**

It seems the password is required due to the Spring Apps API requiring it to be set within the imageregistrycredential as documented here - https://learn.microsoft.com/en-us/rest/api/azurespringapps/deployments/update?tabs=HTTP#imageregistrycredential

**Can we contact you for additional details?**

Yes.

Commencez par les Azure CLI deployment create/update parameters et la Azure Spring Apps deployments update API, en particulier imageregistrycredential. Comparez les flux demandés de managed identity ou d’ACR access-token avec la documentation actuelle de l’API et de la CLI. Le travail est terminé lorsqu’une image Azure Container Registry peut être déployée sans fournir de mot de passe, avec le flux d’authentification pris en charge documenté et testé.

Rédigé par le modèle d'indexation à partir du texte de l'issue.