ACI containers crash on startup: missing AZURE_UAMI_RESOURCE_ID env var + failed containers leak quota #355

Problem

Two bugs cause every ACI benchmark run to fail:

1. Missing env var: AZURE_UAMI_RESOURCE_ID is required by Config at import time (_require_env), but _create_container_instance in main.py never forwards it to the container's --environment-variables. Containers crash immediately on startup with OSError: Required environment variable 'AZURE_UAMI_RESOURCE_ID' is not set.

2. Quota cascade: When a container fails, _check_container_state raises and _delete_container_instance on the next line never executes. Failed containers keep holding ACI cores, and subsequent batches hit ContainerGroupQuotaReached (Usage: 42, Limit: 40).

Fix

• Forward AZURE_UAMI_RESOURCE_ID to containers via --environment-variables
• Wrap _check_container_state in try/finally so cleanup always runs