Read DB connection details from env

config/dev.exs

@@ -2,11 +2,11 @@ import Config
 
 # Configure your database
 config :gc_index_relay, GcIndexRelay.Repo,
-  port: 5432,
-  username: "postgres",
-  password: "postgres",
-  hostname: "localhost",
-  database: "gc_index_relay_dev",
+  username: System.get_env("POSTGRES_USER"),
+  password: System.get_env("POSTGRES_PASSWORD"),
+  database: System.get_env("POSTGRES_DB"),
+  hostname: System.get_env("POSTGRES_HOST"),
+  port: System.get_env("POSTGRES_PORT"),
   stacktrace: true,
   show_sensitive_data_on_connection_error: true,
   pool_size: 10

config/test.exs

@@ -8,11 +8,11 @@ config :gc_index_relay, :start_repo, true
 # to provide built-in test partitioning in CI environment.
 # Run `mix help test` for more information.
 config :gc_index_relay, GcIndexRelay.Repo,
-  port: 5432,
-  username: "postgres",
-  password: "postgres",
-  hostname: "localhost",
-  database: "gc_index_relay_test#{System.get_env("MIX_TEST_PARTITION")}",
+  username: System.get_env("POSTGRES_USER"),
+  password: System.get_env("POSTGRES_PASSWORD"),
+  hostname: System.get_env("POSTGRES_HOST"),
+  port: System.get_env("POSTGRES_PORT"),
+  database: "#{System.get_env("POSTGRES_DB")}#{System.get_env("MIX_TEST_PARTITION")}",
   pool: Ecto.Adapters.SQL.Sandbox,
   pool_size: System.schedulers_online() * 2