Improve Phoenix integration #426

Job	Run time
static analysis (Elixir 1.15.x \| Erlang/OTP 26.x)	55s
mix test (Elixir 1.12.x \| Erlang/OTP 22.x)	1m 8s
mix test (Elixir 1.12.x \| Erlang/OTP 23.x)	50s
mix test windows (Elixir 1.12.x \| Erlang/OTP 22.x)	1m 26s
mix test (Elixir 1.12.x \| Erlang/OTP 24.x)	41s
mix test windows (Elixir 1.12.x \| Erlang/OTP 23.x)	1m 30s
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	1m 0s
mix test windows (Elixir 1.12.x \| Erlang/OTP 24.x)	1m 46s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	2m 2s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	46s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	38s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	1m 29s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	44s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	1m 28s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	1m 22s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	1m 53s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	1m 9s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	1m 28s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	1m 14s
mix test (Elixir 1.14.x \| Erlang/OTP 26.x)	56s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	1m 22s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	40s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	2m 7s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	43s
mix test windows (Elixir 1.14.x \| Erlang/OTP 26.x)	1m 51s
mix test (Elixir 1.15.x \| Erlang/OTP 26.x)	1m 3s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	1m 34s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	1m 46s
mix test windows (Elixir 1.15.x \| Erlang/OTP 26.x)	1m 19s
	36m 50s

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