POSTGRES_HOST_AUTH_METHOD=trust

config/docker.exs

@@ -15,7 +15,7 @@ config :pleroma, :instance,
 config :pleroma, Pleroma.Repo,
   adapter: Ecto.Adapters.Postgres,
   username: System.get_env("DB_USER", "pleroma"),
-  password: System.fetch_env!("DB_PASS"),
+  password: System.get_env("DB_PASS", nil),
   database: System.get_env("DB_NAME", "pleroma"),
   hostname: System.get_env("DB_HOST", "db"),
   pool_size: 10

docker-compose.yml

@@ -19,8 +19,6 @@ services:
     volumes:
       - ./uploads:/var/lib/pleroma/uploads
       - ./config:/var/lib/pleroma/config
-    environment:
-      - "DB_PASS="
 
   db:
     restart: always