ci: run doctests

.github/workflows/ci.yml

@@ -52,6 +52,18 @@ jobs:
         if: ${{ matrix.rust != '1.75' }} # MSRV
         run: cargo nextest run --workspace ${{ matrix.flags }}
 
+  doctest:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@v2
+        with:
+          cache-on-failure: true
+      - run: cargo test --workspace --doc
+      - run: cargo test --all-features --workspace --doc
+
   wasm:
     runs-on: ubuntu-latest
     timeout-minutes: 30