Frontend CI (#51)

## Motivation

We currently don't test the frontend build in CI.

## Proposal

Test it. Also, use the Nix flake to make sure we have all the
dependencies instead of reproducing our dependency list in our GitHub
actions.

## Test Plan

This PR!

Author: Twey

.github/workflows/main.yml

@@ -15,16 +15,10 @@ jobs:
   backend:
     runs-on: ubuntu-latest
     steps:
-      - name: 'Checkout'
-        uses: actions/checkout@v3
-
-      - name: 'Install Rust toolchain'
-        uses: actions-rust-lang/setup-rust-toolchain@v1
-
-      - name: 'Install Protoc'
-        uses: arduino/setup-protoc@v3
-        with:
-          repo-token: ${{ secrets.GITHUB_TOKEN }}
+      - uses: actions/checkout@v3
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+      - uses: nicknovitski/nix-develop@v1
 
       - name: 'Install linera-storage-service'
         uses: taiki-e/cache-cargo-install-action@v2
@@ -60,6 +54,20 @@ jobs:
       - name: 'Verify that code-generated files are unchanged'
         run: git diff --exit-code
 
+  frontend:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+      - uses: nicknovitski/nix-develop@v1
+
+      - name: Build frontend
+        run: |
+          cd frontend
+          pnpm install
+          pnpm build
+
   lint-cargo-fmt:
     runs-on: ubuntu-latest
     steps:

flake.nix

@@ -28,29 +28,33 @@
         inputsFrom = [
           config.treefmt.build.devShell
         ];
-        
+
         buildInputs = with pkgs; [
           # Frontend dependencies
           nodejs
           pnpm
-          
+
           # Rust toolchain from rust-toolchain.toml
           (rust-bin.fromRustupToolchainFile ./rust-toolchain.toml)
-          
-          # Build tools
+
+          # Linera dependencies
           pkg-config
           openssl
           protobuf
-          
+          clang
+          clang.cc.lib
+          libiconv
+
           # Deployment tools
           google-cloud-sdk
-          
+
           # Development tools
           jq
         ];
-        
+
         shellHook = ''
           export PATH=$PWD/target/debug:$PATH
+          export LIBCLANG_PATH="${pkgs.clang.cc.lib}/lib"
           echo "Game of Life Challenge development environment"
           echo "- Frontend: cd frontend && pnpm install && pnpm build"
           echo "- Backend: cargo build"
@@ -66,4 +70,4 @@
       };
     };
   };
-}
+}