Unsafe HOME environment variable access in create_ci_badge.py

[brianredbeard]

Description

The create_ci_badge.py script assumes the HOME environment variable exists and directly accesses it without validation. This causes a
KeyError exception when HOME is not set (common in containerized CI environments).

Location

https://github.com/validatedpatterns/multicloud-gitops/blob/main/tests/interop/create_ci_badge.py#L29

oc = f"{os.environ['HOME']}/oc_client/oc"

Expected Behavior

Use os.environ.get("HOME", "/tmp") or similar fallback to handle missing environment variable gracefully.