Migrate package deployments to GitHub actions

[t1gor]

cc @t1gor

Problem

We used to have Travis CI, but it does not work any more.

Details....

https://github.com/marketplace/actions/npm-publish#github-action

on:
  push:
    branches: main

jobs:
  publish:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v3
        with:
          node-version: "20"
      - run: npm ci
      - run: npm test
      - uses: JS-DevTools/npm-publish@v3
        with:
          token: ${{ secrets.NPM_TOKEN }}