ci: add missing build workflow (#22)

.github/workflows/build.yml

@@ -0,0 +1,37 @@
+name: Run build
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest-16-core
+    strategy:
+      matrix:
+        environment: [devnet-1, testnet-1]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up NodeJS
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+          cache: 'npm'
+
+      - name: Install npm packages
+        run: npm ci
+
+      - name: Run build
+        run: npm run build
+        env:
+          VITE_ERC20_MESSAGING_CONTRACT_ADDRESS: ${{ vars.ERC20_MESSAGING_CONTRACT_ADDRESS }}
+          VITE_SUBNET_REGISTRATOR_CONTRACT_ADDRESS: ${{ vars.SUBNET_REGISTRATOR_CONTRACT_ADDRESS }}
+          VITE_TOPOS_CORE_PROXY_CONTRACT_ADDRESS: ${{ vars.TOPOS_CORE_PROXY_CONTRACT_ADDRESS }}
+          VITE_TOPOS_SUBNET_ENDPOINT_REMOTE_DEFAULT: ${{ vars.TOPOS_SUBNET_ENDPOINT_REMOTE_DEFAULT }}
+          VITE_TOPOS_SUBNET_ENDPOINT_CUSTOM_DEFAULT: ${{ vars.TOPOS_SUBNET_ENDPOINT_CUSTOM_DEFAULT }}
+          VITE_TCE_ENDPOINT_REMOTE_DEFAULT: ${{ vars.TCE_ENDPOINT_REMOTE_DEFAULT }}
+          VITE_TCE_ENDPOINT_CUSTOM_DEFAULT: ${{ vars.TCE_ENDPOINT_CUSTOM_DEFAULT }}