chore: added github action

.github/workflows/build.yml

@@ -0,0 +1,39 @@
+name: Build Project
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+
+    - name: Set up Node.js
+      uses: actions/setup-node@v3
+      with:
+        node-version: 18
+
+    - name: Install Node.js dependencies
+      run: npm install
+      working-directory: string-art-demo
+
+    - name: Set up Rust
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: stable
+        override: true
+
+    - name: Build WASM
+      run: ./build-wasm.sh
+
+    - name: Build JavaScript project
+      run: npm run build
+      working-directory: string-art-demo