add ci workflow

Author: paripuranam

.github/workflows/ci.yml

@@ -0,0 +1,112 @@
+name: CI
+
+on:
+  push:
+    branches: [ci]
+  pull_request:
+    branches: [main]
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  backend:
+    name: Backend — Build & Test (Go)
+    runs-on: ubuntu-latest
+
+    defaults:
+      run:
+        working-directory: backend
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.22'
+          cache: true
+
+      - name: Install dependencies
+        run: go mod download
+
+      - name: Lint
+        uses: golangci/golangci-lint-action@v6
+        with:
+          version: latest
+          working-directory: backend
+
+      - name: Run tests
+        run: go test ./... -v -coverprofile=coverage.out
+
+      - name: Upload coverage
+        uses: actions/upload-artifact@v4
+        with:
+          name: backend-coverage
+          path: backend/coverage.out
+
+      - name: Build production binary
+        run: |
+          mkdir -p ../build
+          go build -o ../build/aran-mcp ./cmd/server
+
+      - name: Upload backend artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: backend-build
+          path: build/aran-mcp
+
+  frontend:
+    name: Frontend — Build & Test (Next.js)
+    runs-on: ubuntu-latest
+    needs: backend
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: '18'
+          cache: 'npm'
+          cache-dependency-path: frontend/package-lock.json
+
+      - name: Install dependencies
+        working-directory: frontend
+        run: npm ci
+
+      - name: Lint
+        working-directory: frontend
+        run: npm run lint
+
+      - name: Type-check
+        working-directory: frontend
+        run: npm run type-check
+
+      - name: Cache Next.js build
+        uses: actions/cache@v3
+        with:
+          path: frontend/.next/cache
+          key: frontend-build-${{ runner.os }}-${{ hashFiles('frontend/package-lock.json') }}
+
+      - name: Build
+        working-directory: frontend
+        run: npm run build
+
+      - name: Run tests (if any)
+        working-directory: frontend
+        run: |
+          if [ -n "$(find frontend -type f -name '*.test.*')" ]; then
+            npm test
+          fi
+
+      - name: Upload frontend artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: frontend-build
+          path: frontend/.next