Separate WASM build into separate job.

.github/workflows/test.yml

@@ -15,6 +15,14 @@ jobs:
           sudo apt-get install -y libspeechd-dev
           rustup update
           cargo build --release
+
+  build_web:
+    name: Build Web
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: |
+          rustup update
           rustup target add wasm32-unknown-unknown
           cargo build --release --target wasm32-unknown-unknown