ci: enable derive feature on stable

Author: mkroening

.github/workflows/build.yml

@@ -12,15 +12,15 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
-      - run: cargo check --workspace
+      - run: cargo check --workspace --features derive
 
   test:
     name: Test Suite
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
-      - run: cargo test --workspace
+      - run: cargo test --workspace --features derive
 
   unstable:
     name: Test Suite (unstable)
@@ -47,4 +47,4 @@ jobs:
         with:
           components: clippy, rustfmt
       - run: cargo fmt --all --check
-      - run: cargo clippy --workspace
+      - run: cargo clippy --workspace --features derive