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

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

ci/steps/publish-npm.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+main() {
+  cd "$(dirname "$0")/../.."
+
+  echo "//registry.npmjs.org/:_authToken=${NPM_TOKEN}" > ~/.npmrc
+  ./ci/container/exec.sh yarn publish --non-interactive release
+}
+
+main "$@"