Add docker file to build the image to execute CI

docker/ci.dockerfile

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+FROM python:3.6.15
+ARG EXTRA_PYPI_INDEX=https://pypi.org/simple
+
+# Allows for log messages by `print` in Python to be immediately dumped
+# to the stream instead of being buffered.
+ENV PYTHONUNBUFFERED 0
+
+COPY docker/scripts/bashrc /etc/bash.bashrc
+RUN chmod a+rx /etc/bash.bashrc
+
+RUN apt-get update && apt-get install -y \
+ unzip \
+ curl \
+ git \
+ software-properties-common \
+ g++ \
+ wget \
+ cmake \
+ ca-certificates \
+ shellcheck \
+ clang-format > /dev/null && \
+ python -m pip install --quiet --upgrade pip
+
+# Install Go and related tools
+ARG GO_MIRROR_URL=https://dl.google.com/go
+ENV GOPATH /root/go
+ENV PATH /usr/local/go/bin:$GOPATH/bin:$PATH
+COPY docker/scripts/install-go.bash /
+RUN /install-go.bash ${GO_MIRROR_URL} && rm /install-go.bash
+
+# Install protobuf and protoc
+COPY docker/scripts/install-protobuf.bash /
+RUN /install-protobuf.bash && rm /install-protobuf.bash
+
+# Install Pre-commit
+RUN pip install pre-commit pytest

docker/scripts/bashrc

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+export PS1="\[\e[31m\]easydl-docker\[\e[m\] \[\e[33m\]\w\[\e[m\] > "
+export TERM=xterm-256color
+alias grep="grep --color=auto"
+alias ls="ls --color=auto"
+
+echo -e "\e[1;31m"
+cat<<EasyDL
+ ______ ____ __ 
+ / ____/____ _ _____ __ __ / __ \ / / 
+ / __/ / __ // ___// / / // / / // / 
+ / /___ / /_/ /(__ )/ /_/ // /_/ // /___
+/_____/ \__,_//____/ \__, //_____//_____/
+ /____/ 
+EasyDL
+echo -e "\e[0;33m"
+
+if [[ $EUID -eq 0 ]]; then
+ cat <<WARN
+WARNING: You are running this container as root, which can cause new files in
+mounted volumes to be created as the root user on your host machine.
+To avoid this, run the container by specifying your user's userid:
+$ docker run -u \$(id -u):\$(id -g) args...
+WARN
+else
+ cat <<EXPL
+You are running this container as user with ID $(id -u) and group $(id -g),
+which should map to the ID and group for your user on the Docker host. Great!
+EXPL
+fi
+
+# Turn off colors
+echo -e "\e[m"

docker/scripts/install-go.bash

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+#!/bin/bash
+
+set -e
+
+GO_MIRROR_URL=$1
+
+curl --silent "$GO_MIRROR_URL"/go1.13.4.linux-amd64.tar.gz | \
+ tar -C /usr/local -xzf -
+
+go env -w GO111MODULE=on
+go env -w GOPROXY=https://goproxy.io,direct
+
+go get github.com/golang/protobuf/[email protected] > /dev/null
+go get golang.org/x/lint/golint > /dev/null
+go get golang.org/x/tools/cmd/goyacc > /dev/null
+go get golang.org/x/tools/cmd/cover > /dev/null
+go get github.com/mattn/goveralls > /dev/null
+go get github.com/rakyll/gotest > /dev/null
+
+cp "$GOPATH"/bin/* /usr/local/bin/

docker/scripts/install-protobuf.bash

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+#!/bin/bash
+
+set -e
+
+wget -q https://github.com/protocolbuffers/protobuf/releases/download/v3.7.1/protoc-3.7.1-linux-x86_64.zip
+unzip -qq protoc-3.7.1-linux-x86_64.zip -d /usr/local
+rm protoc-3.7.1-linux-x86_64.zip