add automatic metadata generation at commit

.rusty-hook.toml

 [hooks]
-pre-commit = "cargo fmt -- --check"
+pre-commit = "cargo fmt -- --check ; resources/metadata_hook.sh"
 
 [logging]
 verbose = true

Cargo.toml

@@ -46,6 +46,7 @@ substrate-build-script-utils = { git = 'https://github.com/duniter/substrate', b
 
 [dev-dependencies]
 rusty-hook = "^0.11.2"
+subxt-cli = "^0.33"
 
 # Dependencies for specific targets
 [target.'cfg(any(target_arch="x86_64", target_arch="aarch64"))'.dependencies]

resources/metadata_hook.sh

+#!/bin/sh
+
+cargo build
+cargo run -- --dev&
+sleep 10
+$HOME/.cargo/bin/subxt metadata -f bytes > resources/metadata.scale
+kill $!
+git add resources/metadata.scale
+