ci: add quick-check with rustfmt (#615)

* ci: add quick-check with clippy and rustfmt

* chore: rustfmt round

* chore: set the same rustfmt config than substrate

* chore: fix formatting

* cI: remove clippy

* ci: switch to nightly for the checks

* ci: fix toolchains and naming

* ci: Limit the check to formatting

* chore: fix formatting

* Update .rustfmt.toml

* Update .rustfmt.toml

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

pallets/aura-ext/src/lib.rs

@@ -131,18 +131,14 @@ where
 				(Some(s), false) => {
 					seal = Some(s);
 					false
-				}
+				},
 			}
 		});
 
 		let seal = seal.expect("Could not find an AuRa seal digest!");
 
 		let author = Aura::<T>::find_author(
-			header
-				.digest()
-				.logs()
-				.iter()
-				.filter_map(|d| d.as_pre_runtime()),
+			header.digest().logs().iter().filter_map(|d| d.as_pre_runtime()),
 		)
 		.expect("Could not find AuRa author index!");
 
@@ -150,9 +146,9 @@ where
 
 		if !authorities
 			.get(author as usize)
-			.unwrap_or_else(||
+			.unwrap_or_else(|| {
 				panic!("Invalid AuRa author index {} for authorities: {:?}", author, authorities)
-			)
+			})
 			.verify(&pre_hash, &seal)
 		{
 			panic!("Invalid AuRa seal");