committing changes in /etc made by "apt-get install -y -qq --no-install-recommends docker-ce"

Package changes:
+containerd.io 1.4.4-1 armhf
+docker-ce 5:20.10.5~3-0~raspbian-buster armhf
+docker-ce-cli 5:20.10.5~3-0~raspbian-buster armhf

default/docker

@@ -0,0 +1,20 @@
+# Docker Upstart and SysVinit configuration file
+
+#
+# THIS FILE DOES NOT APPLY TO SYSTEMD
+#
+#   Please see the documentation for "systemd drop-ins":
+#   https://docs.docker.com/engine/admin/systemd/
+#
+
+# Customize location of Docker binary (especially for development testing).
+#DOCKERD="/usr/local/bin/dockerd"
+
+# Use DOCKER_OPTS to modify the daemon startup options.
+#DOCKER_OPTS="--dns 8.8.8.8 --dns 8.8.4.4"
+
+# If you need Docker to use an HTTP proxy, it can also be specified here.
+#export http_proxy="http://127.0.0.1:3128/"
+
+# This is also a handy place to tweak where Docker's temporary files go.
+#export DOCKER_TMPDIR="/mnt/bigdrive/docker-tmp"