Add Docker container for building releases

build/Dockerfile

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+FROM ubuntu:20.04
+
+RUN apt-get update -y && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y \
+        nodejs \
+        npm \
+        git
+
+# unprivileged user
+RUN mkdir -p /code && \
+    groupadd -g $HOST_GID $USER && \
+    useradd -r -u $HOST_UID -g $HOST_GID $USER && \
+    chown $HOST_UID:$HOST_GID /code && \
+    mkdir -p /home/$USER && \
+    chown $HOST_UID:$HOST_GID /home/$USER
+
+USER $HOST_UID
+
+# use https for git instead of ssh
+RUN git config --global url."https://github.com/".insteadOf [email protected]: && \
+    git config --global url."https://".insteadOf git:// && \
+    git config --global url."https://".insteadOf ssh://
+
+ENTRYPOINT "/bin/bash"

build/README.txt

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+This Docker environment is used for making release builds. Run `./buildenv.sh`.

build/buildenv.sh

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+#!/bin/bash
+set -euxo pipefail
+
+export IMAGE_NAME="chromeshack"
+export HOST_UID=$(id -u "$USER")
+export HOST_GID=$(id -g "$USER")
+
+cat Dockerfile | envsubst | docker build -t $IMAGE_NAME -
+
+pushd ..
+docker run --rm --tty --interactive --volume "$PWD:/code" --workdir /code --name $IMAGE_NAME $IMAGE_NAME
+popd