Improve Phoenix integration #429

Job	Run time
static analysis (Elixir 1.15.x \| Erlang/OTP 26.x)	52s
mix test windows (Elixir 1.12.x \| Erlang/OTP 22.x)	1m 18s
mix test windows (Elixir 1.12.x \| Erlang/OTP 23.x)	2m 27s
mix test windows (Elixir 1.12.x \| Erlang/OTP 24.x)	2m 2s
mix test (Elixir 1.12.x \| Erlang/OTP 22.x)	39s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	2m 23s
mix test (Elixir 1.12.x \| Erlang/OTP 23.x)	46s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	2m 41s
mix test (Elixir 1.12.x \| Erlang/OTP 24.x)	59s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	1m 30s
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	1m 9s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	1m 4s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	1m 39s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	41s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	1m 56s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	1m 3s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	1m 24s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	1m 6s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	1m 28s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	1m 1s
mix test windows (Elixir 1.14.x \| Erlang/OTP 26.x)	2m 6s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	1m 10s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	2m 30s
mix test (Elixir 1.14.x \| Erlang/OTP 26.x)	40s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	2m 20s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	40s
mix test windows (Elixir 1.15.x \| Erlang/OTP 26.x)	1m 32s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	38s
mix test (Elixir 1.15.x \| Erlang/OTP 26.x)	1m 9s
	40m 53s

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