Add rust fmt to github action

.github/workflows/rust.yml

@@ -1,19 +1,23 @@
 name: Rust
 
-on: 
+on:
   push:
   pull_request:
 
 env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  build:
+  test:
     runs-on: ubuntu-latest
-
     steps:
       - uses: actions/checkout@v2
-      - name: Build
-        run: cargo build --verbose
       - name: Run tests
         run: cargo test --verbose
+
+  format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Format
+        run: cargo fmt