Phoenix Elixir Distillery not using correct database connection - postgresql

Question

I'm trying to build a Phoenix application with Distillery, however when I try start the compiled application I keep getting an error about not being able to fine the database.
17:44:50.925 [error] GenServer #PID<0.1276.0> terminating
** (KeyError) key :database not found in: [hostname: "localhost", username: "martinffx", types: Ecto.Adapters.Postgres.TypeModule, port: 5432, name: Glitchr.Repo.Pool, otp_app: :glitchr, repo: Glitchr.Repo, adapter: Ecto.Adapters.Postgres, pool_size: 10, ssl: true, pool_timeout: 5000, timeout: 15000, adapter: Ecto.Adapters.Postgres, pool_size: 10, ssl: true, pool: DBConnection.Poolboy]
(elixir) lib/keyword.ex:343: Keyword.fetch!/2
(postgrex) lib/postgrex/protocol.ex:76: Postgrex.Protocol.connect/1
(db_connection) lib/db_connection/connection.ex:134: DBConnection.Connection.connect/2
(connection) lib/connection.ex:622: Connection.enter_connect/5
(stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
Last message: nil
Now the details above aren't what I've provided in the prod.ex
config :glitchr, Glitchr.Endpoint,
http: [port: {:system, "PORT"}],
url: [host: "localhost", port: {:system, "PORT"}],
cache_static_manifest: "priv/static/manifest.json",
server: true,
root: ".",
version: Mix.Project.config[:version],
secret_key_base: System.get_env("SECRET_KEY_BASE")
config :glitchr, Glitchr.Repo,
adapter: Ecto.Adapters.Postgres,
url: System.get_env("DATABASE_URL"),
pool_size: String.to_integer(System.get_env("POOL_SIZE") || "10"),
ssl: true
Where my database url is DATABASE_URL=postgres://glitchr:password#db:5433/glitchr
Why is that? How can I debug what I'm not getting right?