ci: add wasm32-unknown-unknown

Author: ctron

.github/workflows/ci.yaml

@@ -29,6 +29,9 @@ jobs:
             target/
           key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
 
+      - run: |
+          rustup target add wasm32-unknown-unknown
+
       - name: Build
         run: cargo build --release