Create Github Actions

[pablisco]

This adds a Github workflow to run the library tests.

Bonus: Had to update dependencies to make it work with Github Actions.

[zegnus]

This will trigger a full build every single time there is a push on any branch.
This should be scoped to just master for example, and only trigger builds for pull requests:

on:
  pull_request
  push:
    branches:
      - master

For testing purposes, what you can do is to trigger a push on your dev branch temporary

on:
  push:
    branches:
      - mydevbranch

[zegnus]

here you can add:

env:
  GRADLE_USER_HOME: .gradle

[zegnus]

and then you can add a cache here, as the project is very small, it will work:

- name: Cache dependencies
  uses: actions/cache@v1
  with:
    path: .gradle/caches
    key: gradle-cache-${{ hashFiles('**/*.gradle') }}
    restore-keys:   gradle-cache

[zegnus]

you can also add --no-daemon, do we also need to add buid?

[pablisco]

check depends on build so it's not required explicitly