Document to use runtime: false for rustler dependency #957

Job	Run time
Format	26s
Build ubuntu stable	25s
Build ubuntu nightly	31s
Build windows stable	1m 20s
Build windows nightly	1m 16s
Build macos stable	44s
Build macos nightly	47s
Clippy ubuntu	39s
Clippy windows	52s
Clippy macos	52s
OTP 26 / Elixir 1.14 / Rust stable / OS macos	1s
OTP 26 / Elixir 1.14 / Rust stable / OS ubuntu	2m 40s
OTP 26 / Elixir 1.14 / Rust nightly / OS macos	1m 31s
OTP 26 / Elixir 1.14 / Rust nightly / OS ubuntu	2m 19s
OTP 25 / Elixir 1.14 / Rust stable / OS macos	2m 31s
OTP 25 / Elixir 1.14 / Rust stable / OS windows	2m 37s
OTP 25 / Elixir 1.14 / Rust stable / OS ubuntu	1m 55s
OTP 25 / Elixir 1.14 / Rust nightly / OS macos	2m 38s
OTP 25 / Elixir 1.14 / Rust nightly / OS windows	2m 34s
OTP 25 / Elixir 1.14 / Rust nightly / OS ubuntu	2m 11s
OTP 24 / Elixir 1.13 / Rust stable / OS macos	2m 40s
OTP 24 / Elixir 1.13 / Rust stable / OS windows	2m 30s
OTP 24 / Elixir 1.13 / Rust stable / OS ubuntu	1m 53s
OTP 24 / Elixir 1.13 / Rust nightly / OS macos	2m 43s
OTP 24 / Elixir 1.13 / Rust nightly / OS windows	2m 25s
OTP 24 / Elixir 1.13 / Rust nightly / OS ubuntu	2m 8s
	43m 8s

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