Add justfile

Add a `justfile` to make dev life easier.

Author: tcharding

justfile

@@ -0,0 +1,22 @@
+default:
+  @just --list
+
+# Cargo build everything.
+build:
+  cargo build --all-targets
+
+# Cargo check everything.
+check:
+  cargo check --all-targets
+
+# Lint everything.
+lint:
+  cargo clippy --all-targets -- --deny warnings
+
+# Check the formatting
+format:
+  cargo +nightly fmt --all --check
+
+# Update the recent and minimal lock files.
+update-lock-files:
+  contrib/update-lock-files.sh