[WIP] Add a GitHub action to build the Elixir API

.github/workflows/api.yml

@@ -0,0 +1,57 @@
+name: Elixir API CI
+
+on:
+  push:
+    paths:
+      - '.github/workflows/api.yml'
+      - 'api/*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    container:
+      image: elixir:1.9
+      env:
+        MIX_ENV: test
+        DATABASE_HOST: postgresql
+
+    services:
+      postgresql:
+        image: postgres
+        env:
+          POSTGRES_PASSWORD: postgres
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Install dependencies
+        working-directory: api/
+        run: |
+          mix local.rebar --force
+          mix local.hex --force
+          mix deps.get
+      - name: Setup database
+        working-directory: api/
+        run: |
+          mix ecto.create
+          mix ecto.migrate
+      - name: Run tests
+        working-directory: api/
+        run: |
+          mix format --check-formatted
+          mix test
+
+  deploy:
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - uses: actions/checkout@v1
+      - name: Deploy to Gigalixir
+        # if: github.ref == 'refs/heads/master'
+        working-directory: api/
+        run: ./scripts/deploy.sh

api/config/test.exs

@@ -5,7 +5,7 @@ config :locationiser, Locationiser.Repo,
   username: "postgres",
   password: "postgres",
   database: "locationiser_test",
-  hostname: "localhost",
+  hostname: System.get_env("DATABASE_HOST") || "localhost",
   pool: Ecto.Adapters.SQL.Sandbox
 
 # We don't run a server during test. If one is required,