compose: container app not deployed after azd adding a database and provisioning changes for first time

[JeffreyCA]

Repro steps

1. azd config set alpha.compose on
2. In an empty directory: azd init -t JeffreyCA/minimal-flask-app (source) and provide an environment name.
3. azd add - Select Database, then input the following:
   • Which type of database? MongoDB
   • Input the name of the app database (MongoDB): mdb
   • Select the service(s) that uses this resource: [✓] pyservice
   • Accept changes to azure.yaml? Yes
   • Do you want to provision these changes? Yes
4. Proceed through remaining prompts to provision the changes

The Python Flask app fails to load at the container app endpoint, and the container app revision reports a status of: "The TargetPort 5000 does not match the listening port 80".

Another way to repro the issue is to clone the above sample app with an empty azure.yml, then progressively azd add a container app (do not provision) and then a database (provision).

One workaround is to run azd up afterwards to deploy the changes.