Remove --userns=keep-id in create_container.sh

With a mapped user namespace, recent podman versions fail to mount /sys

This removes some isolation, similar to using uid 0 in a regular Docker container.

Test Plan: Ran build

X-Origin-Diff: phab/D238
GitOrigin-RevId: 39dc826f4ce95a6c5b405a49be3d2e9d19174fc1
diff --git a/scripts/create_container.sh b/scripts/create_container.sh
index c9c2db1..de9d2cb 100755
--- a/scripts/create_container.sh
+++ b/scripts/create_container.sh
@@ -36,7 +36,6 @@
     --tmpfs=/user/.cache/bazel:exec \
     --device /dev/kvm \
     --privileged \
-    --userns=keep-id \
     --pod nexantic \
     --name=nexantic-dev \
     nexantic-builder