test: avoid infamy0 race in CI by using random container names

GitHub Actions sets $CI=true; treat it like -r so parallel jobs
don't all try to claim "infamy0" and clobber each other.

Author: rical

test/env

@@ -122,7 +122,7 @@ name()
     nm=infamy
     id=0
 
-    if [ -n "$random" ]; then
+    if [ -n "$random" ] || [ -n "$CI" ]; then
 	# Let podman/docker allocate random hostname and container name
 	return
     fi