acct-group/docker: add stub

Cherry-pick of crrev/c/2638419

BUG=b/176912333
TEST=emerge-lakitu acct-group/docker, cq

Change-Id: Id1bc3f6dc5a365593f2cb5d37f881523b97d55b2
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/eclass-overlay/+/10806
Reviewed-by: Roy Yang <royyang@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
diff --git a/acct-group/docker/docker-0.0.1.ebuild b/acct-group/docker/docker-0.0.1.ebuild
new file mode 100644
index 0000000..ca0e83f
--- /dev/null
+++ b/acct-group/docker/docker-0.0.1.ebuild
@@ -0,0 +1,15 @@
+# Copyright 2021 The Chromium OS Authors. All rights reserved.
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+SLOT="0"
+KEYWORDS="*"
+
+inherit user
+
+# TODO(crbug.com/1026816): this ebuild is just a placeholder (to satisfy Gentoo
+# dependencies) while we wait to implement acct-{group,user} properly.
+pkg_setup() {
+	enewgroup docker
+}