Add wasm build step to CI

.github/workflows/build.yml

@@ -110,6 +110,32 @@ jobs:
       with:
         command: build
         args: --manifest-path=no_std/no_std_test/Cargo.toml ${{matrix.flags}}
+  wasm:
+    name: Check Wasm build
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        flags:
+          - ""
+          - "--no-default-features"
+          - "--features wasm-bindgen"
+          - "--no-default-features --features wasm-bindgen"
+      fail-fast: false
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup Toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ env.RUST_MSRV }}
+          override: true
+          target: wasm32-unknown-unknown
+      - name: Build
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --target wasm32-unknown-unknown ${{matrix.flags}}
+
   rustfmt:
     name: Check Formatting
     runs-on: windows-latest