Fix os.environ[container]

Author: vstinner

Lib/test/pythoninfo.py

@@ -310,6 +310,7 @@ def format_groups(groups):
         "COLUMNS",
         "COMPUTERNAME",
         "COMSPEC",
+        "CONTAINER",
         "CPP",
         "CPPFLAGS",
         "DISPLAY",
@@ -370,9 +371,6 @@ def format_groups(groups):
         "_PYTHON_SYSCONFIGDATA_PATH",
         "__PYVENV_LAUNCHER__",
 
-        # Lower case variables
-        "container",
-
         # Sanitizer options
         "ASAN_OPTIONS",
         "LSAN_OPTIONS",