Add the drone CI/CD configuration.

.drone.yml

@@ -0,0 +1,37 @@
+kind: pipeline
+type: docker
+name: default
+
+environment:
+  DATABASE_HOSTNAME: postgres
+
+steps:
+  - name: install dependencies
+    image: elixir:1.16.3
+    volumes:
+      - name: mix
+        path: /root/.mix
+    commands:
+      - mix local.hex --force
+      - mix local.rebar --force
+      - mix deps.get
+
+  - name: run tests
+    image: elixir:1.16.3
+    volumes:
+      - name: mix
+        path: /root/.mix
+    commands:
+      - mix test
+
+volumes:
+- name: mix
+  temp: {}
+
+services:
+  - name: postgres
+    image: postgres:15-alpine
+    environment:
+      POSTGRES_DB: decentralised_book_index_dev
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres

config/test.exs

@@ -8,9 +8,9 @@ config :ash, disable_async?: true
 # to provide built-in test partitioning in CI environment.
 # Run `mix help test` for more information.
 config :decentralised_book_index, DecentralisedBookIndex.Repo,
-  username: "postgres",
-  password: "postgres",
-  hostname: "localhost",
+  username: System.get_env("DATABASE_USERNAME", "postgres"),
+  password: System.get_env("DATABASE_PASSWORD", "postgres"),
+  hostname: System.get_env("DATABASE_HOSTNAME", "localhost"),
   database: "decentralised_book_index_test#{System.get_env("MIX_TEST_PARTITION")}",
   pool: Ecto.Adapters.SQL.Sandbox,
   pool_size: System.schedulers_online() * 2