Add NPM package, debs, rpms and refactor CI/build process

Closes many issues that I'll prune after adding more docs
for users.

ci/container/Dockerfile

@@ -0,0 +1,30 @@
+FROM centos:7
+
+RUN yum update -y && yum install -y \
+    devtoolset-6 \
+    gcc-c++ \
+    xz \
+    ccache \
+    git \
+    wget \
+    openssl \
+    libxkbfile-devel \
+    libsecret-devel \
+    libx11-devel \
+    gettext
+
+RUN yum install -y epel-release && \
+    yum install -y ShellCheck jq golang
+
+RUN go get github.com/goreleaser/nfpm/cmd/nfpm
+ENV PATH=$PATH:/root/go/bin
+
+RUN mkdir /usr/share/node && cd /usr/share/node \
+    && curl "https://nodejs.org/dist/v12.16.3/node-v12.16.3-linux-$(uname -m | sed 's/86_//; s/aarch/arm/').tar.xz" | tar xJ --strip-components=1 --
+ENV PATH "$PATH:/usr/share/node/bin"
+RUN npm install -g yarn@1.22.4
+
+RUN curl -L "https://github.com/mvdan/sh/releases/download/v3.0.1/shfmt_v3.0.1_linux_$(uname -m | sed 's/x86_/amd/; s/aarch64/arm/')" > /usr/local/bin/shfmt \
+    && chmod +x /usr/local/bin/shfmt
+
+ENTRYPOINT ["/bin/bash", "-c"]

ci/container/exec.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+main() {
+  cd "$(dirname "$0")/../.."
+
+  docker build ci/container
+  imageTag="$(docker build -q ci/container)"
+  docker run \
+    --rm \
+    -e CI \
+    -e GITHUB_TOKEN \
+    -e TRAVIS_TAG \
+    -e NPM_TOKEN \
+    -v "$(yarn cache dir):/usr/local/share/.cache/yarn/v6" \
+    $(if [[ -f ~/.npmrc ]]; then echo -v "$HOME/.npmrc:/root/.npmrc"; fi) \
+    -v "$PWD:/repo" \
+    -w /repo \
+    $(if [[ -t 0 ]]; then echo -it; fi) \
+    "$imageTag" \
+    "$*"
+}
+
+main "$@"