Migrate to GitHub Actions from CodeShip CI

Author: achempion

.github/workflows/elixir.yml

@@ -0,0 +1,24 @@
+name: Elixir CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build_and_test:
+
+    name: Build and test
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build the Docker image
+      run: docker build . --file Dockerfile --tag waffle
+
+    - name: Run linters
+      run: docker run waffle_ecto mix credo --strict
+
+    - name: Run tests
+      run: docker run waffle_ecto mix test

Dockerfile.codeship Dockerfile

@@ -1,11 +1,8 @@
 # Waffle
 
-[![Codeship Status for elixir-waffle/waffle][codeship-img]][codeship-url]
 [![Hex.pm Version][hex-img]][hex-url]
 [![waffle documentation][hexdocs-img]][hexdocs-url]
 
-[codeship-img]: https://app.codeship.com/projects/182a04b0-aa53-0137-1d00-2259d5318dee/status?branch=master
-[codeship-url]: https://app.codeship.com/projects/361668
 [hex-img]: http://img.shields.io/hexpm/v/waffle.svg
 [hex-url]: https://hex.pm/packages/waffle
 [hexdocs-img]: http://img.shields.io/badge/hexdocs-documentation-brightgreen.svg

README.md

@@ -3,7 +3,7 @@ services:
   waffle:
     build:
       context: .
-      dockerfile: Dockerfile.codeship
+      dockerfile: Dockerfile
     command: tail -f /dev/null
     env_file:
       - .env