ci: Test building with optional features enabled

Author: ravenexp

.github/workflows/rust.yml

@@ -17,6 +17,8 @@ jobs:
     - uses: actions/checkout@v3
     - name: Build
       run: cargo build --verbose
+    - name: Build with features
+      run: cargo build --features native-certs --verbose
     - name: Run tests
       run: cargo test --verbose
   fmt: