Update CI: trim bench and redundant build from workflow steps (#79)

.github/workflows/rust.yml

@@ -11,22 +11,11 @@ env:
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
 
     steps:
     - uses: actions/checkout@v3
-    - name: Build
-      run: cargo build --all
-    - name: Run tests
-      run: cargo test --all
     - name: Lint with fmt
       run: cargo fmt --all --check
-  benchmark:
-      runs-on: ubuntu-latest
-      steps:
-      - uses: actions/checkout@v3
-      - name: Build
-        run: cargo build --all --release
-      - name: Run benches
-        run: cargo bench
+    - name: Run tests
+      run: cargo test --all