Improve Phoenix integration #427

Job	Run time
static analysis (Elixir 1.15.x \| Erlang/OTP 26.x)	1m 25s
mix test (Elixir 1.12.x \| Erlang/OTP 22.x)	59s
mix test windows (Elixir 1.12.x \| Erlang/OTP 22.x)	1m 26s
mix test (Elixir 1.12.x \| Erlang/OTP 23.x)	48s
mix test windows (Elixir 1.12.x \| Erlang/OTP 23.x)	1m 31s
mix test (Elixir 1.12.x \| Erlang/OTP 24.x)	40s
mix test windows (Elixir 1.12.x \| Erlang/OTP 24.x)	1m 31s
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	42s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	1m 20s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	1m 6s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	1m 13s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	1m 29s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	41s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	1m 28s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	2m 14s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	1m 7s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	1m 36s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	1m 13s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	2m 21s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	40s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	2m 10s
mix test (Elixir 1.14.x \| Erlang/OTP 26.x)	38s
mix test windows (Elixir 1.14.x \| Erlang/OTP 26.x)	2m 15s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	1m 0s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	59s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	1m 50s
mix test (Elixir 1.15.x \| Erlang/OTP 26.x)	39s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	1m 26s
mix test windows (Elixir 1.15.x \| Erlang/OTP 26.x)	1m 25s
	37m 52s

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