chore(build): create dockerfile for release deployment

Signed-off-by: SphericalKat <amolele@gmail.com>

config/prod.exs

@@ -52,4 +52,4 @@ config :logger, level: :info
 
 # Finally import the config/prod.secret.exs which loads secrets
 # and configuration from environment variables.
-import_config "prod.secret.exs"
+# import_config "prod.secret.exs"

config/releases.exs

@@ -2,7 +2,7 @@
 # from environment variables. You can also hardcode secrets,
 # although such is generally not recommended and you have to
 # remember to add this file to your .gitignore.
-use Mix.Config
+import Config
 
 database_url =
   System.get_env("DATABASE_URL") ||
@@ -35,7 +35,7 @@ config :ketbin, KetbinWeb.Endpoint,
 # If you are doing OTP releases, you need to instruct Phoenix
 # to start each relevant endpoint:
 #
-#     config :ketbin, KetbinWeb.Endpoint, server: true
+config :ketbin, KetbinWeb.Endpoint, server: true
 #
 # Then you can assemble a release by calling `mix release`.
 # See `mix help release` for more information.