how would I create database on release task with elixir 1.9?
I found on hexdocx https://hexdocs.pm/phoenix/releases.html#ecto-migrations-and-custom-commands how to run migration, but not database creation

before I upgraded to 1.9 I had in my release script create and migrate following this: https://ronantreacy.com/blog/deploying-phoenix-applications-using-docker-and-distillery

here is my code for creating database:

defmodule Release.Tasks do

  @start_apps [ :postgrex, :ecto ]

  @myapps [:my_app]

  @repos [MyApp.Repo]

  def createdb do

    # Ensure all apps have started
    Enum.each(@myapps, fn(x) ->
      :ok = Application.load(x)
    end)

    # Start postgrex and ecto
    Enum.each(@start_apps, fn(x) ->
      {:ok, _} = Application.ensure_all_started(x)
    end)

    # Create the database if it doesn't exist
    Enum.each(@repos, &ensure_repo_created/1)

    :init.stop()
  end
  

  defp ensure_repo_created(repo) do
    case repo.__adapter__.storage_up(repo.config) do
      :ok -> :ok
      {:error, :already_up} -> :ok
      {:error, term} -> {:error, term}
    end
  end

end

and then I ran it on the pre_start hook like this:
bin/my_app command Elixir.Release.Tasks createdb,
which worked well,

now when I am using 1.9 release, i try running with

./bin/my_app eval 'Release.Tasks.createdb()' 

which follows this error:

** (KeyError) key :database not found in: [telemetry_prefix: [:my_app, :repo], otp_app: :my_app, timeout: 15000, pool_size: 10]
    (elixir) lib/keyword.ex:393: Keyword.fetch!/2
    (ecto_sql) lib/ecto/adapters/postgres.ex:128: Ecto.Adapters.Postgres.storage_up/1
    lib/create_migrate_task.ex:57: Release.Tasks.ensure_repo_created/1
    (elixir) lib/enum.ex:783: Enum."-each/2-lists^foreach/1-0-"/2
    (elixir) lib/enum.ex:783: Enum.each/2
    lib/create_migrate_task.ex:18: Release.Tasks.createdb/0
    (stdlib) erl_eval.erl:680: :erl_eval.do_apply/6

note:
this is my config.exs: (I did not use run time configuration)

import Config

config :my_app,
       ecto_repos: [MyApp.Repo]

config :school, MyApp.Repo,
       database: "my-cool-db",
       password: "changeme",
       hostname: "123.456.8.789",
       port: "5432",
       timeout: 60_000,
       pool_size: 10,
       max_overflow: "100",
       queue_target: 60_000,
       queue_interval: 120_000