Add github action

.github/workflows/build.yml

@@ -0,0 +1,23 @@
+name: Build
+run-name: Build the project
+on: [push]
+jobs:
+  build-client:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+      - run: npm install
+      - run: npm build_client
+      
+  build-server:
+    runs-on: ubuntu-latest
+    steps:
+      - name: install elan
+        run: |
+          set -o pipefail
+          curl -sSfL https://github.com/leanprover/elan/releases/download/v1.4.2/elan-x86_64-unknown-linux-gnu.tar.gz | tar xz
+          ./elan-init -y --default-toolchain none
+          echo "$HOME/.elan/bin" >> $GITHUB_PATH
+      - uses: actions/checkout@v3
+      - run: npm build_client