Merge branch 'main' of https://github.com/contentauth/c2pa-rs into ex…

…ternal_manifest

* 'main' of https://github.com/contentauth/c2pa-rs:
  (IGNORE) Update makefile test to use nightly fmt and add fmt script (#103)

Makefile

@@ -14,7 +14,7 @@ else
 endif
 
 check-format:
-	cargo fmt -- --check
+	cargo +nightly fmt -- --check
 
 check-docs:
 	cargo doc --no-deps --workspace --all-features
@@ -35,6 +35,10 @@ test-wasm:
 # Run this before pushing a PR to pre-validate
 test: check-format check-docs clippy test-local test-no-defaults test-wasm
 
+# Auto format code according to standards
+fmt: 
+	cargo +nightly fmt
+
 # Builds and views documentation
 doc:
 	cargo doc --no-deps --open