No (documented) way to perform env var interpolation in container group yml file

[m1stermanager]

az feedback auto-generates most of the information requested below, as of CLI version 2.0.62

Describe the bug
when specifying a yml file in the az container create the format $VAR ${VAR} and ${env:VAR} are all passed as literals

To Reproduce
create a container group from a yml file and attempt to include a value from your env.

Expected behavior
the value should be interpolated into the yml file when submitted to azure

Environment summary
▶ az --version
azure-cli 2.30.0

core 2.30.0
telemetry 1.0.6

Python location '/opt/az/bin/python3'
Extensions directory '/home/josh/.azure/cliextensions'

Python (Linux) 3.6.10 (default, Oct 29 2021, 10:11:58)
[GCC 7.5.0]

Additional context

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @macolso.

Issue Details

---

az feedback auto-generates most of the information requested below, as of CLI version 2.0.62

Describe the bug
when specifying a yml file in the az container create the format $VAR ${VAR} and ${env:VAR} are all passed as literals

To Reproduce
create a container group from a yml file and attempt to include a value from your env.

Expected behavior
the value should be interpolated into the yml file when submitted to azure

Environment summary
▶ az --version
azure-cli 2.30.0

core 2.30.0
telemetry 1.0.6

Python location '/opt/az/bin/python3'
Extensions directory '/home/josh/.azure/cliextensions'

Python (Linux) 3.6.10 (default, Oct 29 2021, 10:11:58)
[GCC 7.5.0]

Additional context

Author:	m1stermanager
Assignees:	-
Labels:	Service Attention, Container Instances, customer-reported
Milestone:	-

[yonzhan]

route to service team