test: add docker compose profile to execute tests

On this profile a new image is built that can handle tests locally.

docker-compose.yml

@@ -19,6 +19,7 @@ services:
       context: .
       args:
         BUILD_MIX_ENV: dev
+    pull_policy: never
     hostname: &app_host ex_trainer
     depends_on:
       - db
@@ -53,6 +54,39 @@ services:
     scale: 3
     entrypoint: ./priv/docker/service/docker-entrypoint.sh
     command: local-cookie
+  test:
+    image: 'joaodubas/ex_trainer:test'
+    build:
+      target: builder
+      context: .
+      args:
+        BUILD_MIX_ENV: test
+    pull_policy: never
+    profiles:
+      - test
+    hostname: ex_trainer_test
+    depends_on:
+      - db
+    init: true
+    volumes:
+      - './mix.exs:/opt/app/mix.exs:ro'
+      - './mix.lock:/opt/app/mix.lock:ro'
+      - './students.csv:/opt/app/students.csv:ro'
+      - './config:/opt/app/config'
+      - './cover:/opt/app/cover'
+      - './lib:/opt/app/lib'
+      - './priv:/opt/app/priv'
+      - './report:/opt/app/report'
+      - './test:/opt/app/test'
+    environment:
+      POSTGRES_HOST: *db_host
+      POSTGRES_USER: *db_user
+      POSTGRES_PASS: *db_pass
+      POSTGRES_NAME: wabanex_test
+    working_dir: /opt/app
+    restart: never
+    entrypoint: mix test
+    command: --trace --cover --slowest 10
 
 volumes:
   db_data: {}