Add Dockerfile for build system.

docker/entrypoint.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# Add local user
+# Either use the LOCAL_USER_ID if passed in at runtime or
+# fallback
+
+USER_ID=${LOCAL_USER_ID:-9001}
+
+echo "Starting with UID : $USER_ID "
+echo "CARGO_HOME is $CARGO_HOME"
+echo "RUSTUP_HOME is $RUSTUP_HOME"
+useradd --shell /bin/bash -u $USER_ID -o -c "" -m user
+export HOME=/home/user
+chown user:user -R $CARGO_HOME
+chown user:user -R $RUSTUP_HOME
+
+exec gosu user:user "$@"