Build software only once using Nix with the help of Cachix.

1. Login to Cachix and create a new cache. Backup the signing key in the process.

2. As an admin of your github repository:

   1. Click on Settings
   2. Click on Secrets (If missing, you need to sign up first for actions beta)
   3. Add your signing key value under name CACHIX_SIGNING_KEY.

3. Create .github/workflows/test.yml in your repo with the following contents:

name: "Test"
on:
  pull_request:
  push:
jobs:
  tests:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v1
    - uses: cachix/install-nix-action@v2
    - uses: cachix/cachix-action@v1
      with:
        name: cachix-action
        signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
        # Only needed for private caches
        authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'

Install the dependencies

$ yarn install

Build the typescript

$ yarn build

Run the tests ✔️

$ yarn test