Fix serde feature gating in types

.cargo/config.toml

@@ -4,6 +4,7 @@ ci-check-nodejs = "check --manifest-path bindings/nodejs/Cargo.toml --all-target
 ci-check-python = "check --manifest-path bindings/python/Cargo.toml --all-targets --lib"
 ci-check-wasm = "check --manifest-path bindings/wasm/Cargo.toml --target wasm32-unknown-unknown --lib"
 ci-check-nostd = "check --no-default-features -F serde -p iota-sdk --target riscv64gc-unknown-none-elf"
+ci-check-types = "check --no-default-features -p iota-sdk"
 
 ci-test = "nextest run --all-features --profile ci --cargo-profile ci -p iota-sdk -p iota-sdk-bindings-core"
 

.github/workflows/lint.yml

@@ -153,3 +153,17 @@ jobs:
 
       - name: Check
         run: cargo check --no-default-features -F serde -p iota-sdk --target=riscv64gc-unknown-none-elf
+
+  types:
+    name: Check types-only compilation
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout the Source Code
+        uses: actions/checkout@v3
+
+      - name: Set up Rust
+        uses: ./.github/actions/setup-rust
+
+      - name: Check
+        run: cargo check --no-default-features -p iota-sdk