CI: switch to nightly toolchain

Author: wuwbobo2021

.github/workflows/rust.yml .github/workflows/rust_nightly.yml.github/workflows/rust.yml renamed to .github/workflows/rust_nightly.yml

@@ -1,4 +1,4 @@
-name: Rust
+name: Rust - Nightly
 
 on:
   push:
@@ -11,10 +11,12 @@ env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  build:
+  build_and_test:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
+    - run: rustup update nightly && rustup default nightly
+    - run: rustup component add rustfmt
     - name: Check fmt
       run: cargo fmt -- --check
     - name: Test