Update ci.yml (hardhat)

Author: vpnlnetwork

.github/workflows/ci.yml

@@ -0,0 +1,71 @@
+name: CI
+
+on:
+  push:
+    branches: [ main, master ]
+  pull_request:
+    branches: [ main, master ]
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    timeout-minutes: 25
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Use Node.js 20
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Cache npm
+        uses: actions/cache@v4
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-node-${{ hashFiles('package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-
+
+      - name: Install deps
+        run: npm ci
+
+      - name: Compile (Hardhat)
+        run: npx hardhat compile
+
+      - name: Run tests (Hardhat)
+        run: npx hardhat test --network hardhat
+
+      - name: Lint Solidity with solhint (optional)
+        if: hashFiles('.solhint.json') != '' || hashFiles('.solhint.jsonc') != ''
+        run: npx solhint 'contracts/**/*.sol'
+
+  demo-build:
+    name: Build demo (optional)
+    runs-on: ubuntu-latest
+    if: hashFiles('demo/package.json') != ''
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Use Node.js 20
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Cache npm (demo)
+        uses: actions/cache@v4
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-node-demo-${{ hashFiles('demo/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-
+
+      - name: Install demo deps
+        working-directory: demo
+        run: npm ci
+
+      - name: Build demo
+        working-directory: demo
+        run: npm run build