Document to use runtime: false for rustler dependency #949

Job	Run time
Format	24s
Build ubuntu stable	15s
Build ubuntu nightly	35s
Build windows stable	1m 37s
Build windows nightly	1m 20s
Build macos stable	35s
Build macos nightly	1m 3s
Clippy ubuntu	19s
Clippy windows	3m 1s
Clippy macos	44s
OTP 26 / Elixir 1.14 / Rust stable / OS macos	4m 9s
OTP 26 / Elixir 1.14 / Rust stable / OS ubuntu	2m 15s
OTP 26 / Elixir 1.14 / Rust nightly / OS macos	4m 7s
OTP 26 / Elixir 1.14 / Rust nightly / OS ubuntu	2m 36s
OTP 25 / Elixir 1.14 / Rust stable / OS macos	3m 17s
OTP 25 / Elixir 1.14 / Rust stable / OS windows	4m 50s
OTP 25 / Elixir 1.14 / Rust stable / OS ubuntu	1m 39s
OTP 25 / Elixir 1.14 / Rust nightly / OS macos	4m 12s
OTP 25 / Elixir 1.14 / Rust nightly / OS windows	4m 47s
OTP 25 / Elixir 1.14 / Rust nightly / OS ubuntu	1m 43s
OTP 24 / Elixir 1.13 / Rust stable / OS macos	3m 19s
OTP 24 / Elixir 1.13 / Rust stable / OS windows	4m 27s
OTP 24 / Elixir 1.13 / Rust stable / OS ubuntu	1m 43s
OTP 24 / Elixir 1.13 / Rust nightly / OS macos	3m 17s
OTP 24 / Elixir 1.13 / Rust nightly / OS windows	4m 23s
OTP 24 / Elixir 1.13 / Rust nightly / OS ubuntu	2m 2s
	1h 2m 39s

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