[docker] move dev environment setup to "Script to rule them all" (#3383)

etc/docker/environment/Dockerfile

@@ -3,17 +3,9 @@ FROM ubuntu:18.04
 
 ENV DEBIAN_FRONTEND noninteractive
 
-# Install dependencies:
-RUN apt-get update -qq
+RUN apt-get -y update
+RUN apt-get install -y git software-properties-common sudo
 
-# Install packages needed for wpantund build and runtime:
-RUN apt-get install -y build-essential git make autoconf \
-                       autoconf-archive automake dbus libtool gcc \
-                       g++ gperf flex bison texinfo ncurses-dev \
-                       libexpat-dev python sed python-pip gawk \
-                       libreadline6-dev libdbus-1-dev \
-                       libboost-dev inetutils-ping
-
-RUN apt-get install -y --force-yes gcc-arm-none-eabi
-RUN pip install pexpect
+RUN git clone https://github.com/openthread/openthread.git
 
+RUN cd openthread && ./script/bootstrap