TLDR: This PR fixes endpoint port configuration in runtime.exs in a newly generated umbrella application. This is a regression introduced in Phoenix 1.8.2.

I have noticed that with upgrade to Phoenix 1.8.2 port configuration has been moved to runtime.exs and new lines have been added (#6449). I checked what's changed for an umbrella application (on phoenixdiff) and these are the lines that are added:

config :sample_app, SampleAppWeb.Endpoint,
  http: [port: String.to_integer(System.get_env("PORT", "4000"))]

while everywhere else, even in the very same file, SampleAppWeb.Endpoint is configured on sample_app_web, not sample_app.

Steps to reproduce:

1. Create a new umbrella application on Phoenix 1.8.2. Install all dependencies.

mix phx.new test182 --umbrella

2. Switch to the app

cd test182_umbrella

3. Start the app with alternative port

PORT=4500 iex -S mix phx.server

Observe the output.

Actual:

[info] Running Test182Web.Endpoint with Bandit 1.8.0 at 127.0.0.1:4000 (http)
[info] Access Test182Web.Endpoint at http://localhost

As we see, the custom port is not obeyed, and the endpoint URL is missing the port altogether.

Expected:

[info] Running Test182Web.Endpoint with Bandit 1.8.0 at 127.0.0.1:4500 (http)
[info] Access Test182Web.Endpoint at http://localhost:4500