Add github workflow for testing with pdk

name: Run PDK tests

on:

  - push

  - pull_request

jobs:

  tests:

    runs-on: ubuntu-latest

    steps:

      - name: Checkout

        uses: actions/checkout@v2

      - name: Validate

        uses: mysociety/action-pdk@master

        with:

          action: 'validate'

      - name: Run Unit Tests

        uses: mysociety/action-pdk@master

        with:

          action: 'test unit'