Switch CI (to GitHub actions?)

[jtheriault]

As encountered during pull request #75, Drone's migration to use donated resources for open source projects is, however understandable, not viable for production purposes.

For parity, a new CI solution must:

• clone the repo
• npm ci/test/publish
• handle secrets (e.g. the npm deployment token)
• allow running arbitrary commands in Docker containers

  apt-get update
  apt-get install -y ruby-dev build-essential rpm
  gem install fpm
  scripts/build-packages
  

• attach files to the associated release/tag in GitHub

Additionally, it could handle the Docker image deployment process by running scripts/deploy-docker

[jtheriault]

#78 is addressing this with GitHub actions