replace test shell script with justfile

justfile

@@ -0,0 +1,6 @@
+nightly := 'cargo +nightly'
+rustc_nightly_flags := '-Z randomize-layout'
+
+test:
+    RUST_FLAGS='{{rustc_nightly_flags}}' {{nightly}} miri test
+

test.sh

@@ -1,3 +0,0 @@
-#!/bin/bash
-RUSTFLAGS='-Z randomize-layout' cargo +nightly miri test
-