Add CI/CD pipeline configuration

.github/.gitignore

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-ci-cd.yml

.github/workflows/ci-cd.yml

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+name: CI/CD Pipeline
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  check-contracts:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./contracts
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Getting scarb
+        uses: software-mansion/setup-scarb@v1.3.2
+
+      - name: Install Universal Sierra Compiler
+        run: |
+          curl -L https://raw.githubusercontent.com/software-mansion/universal-sierra-compiler/master/scripts/install.sh | sh
+          echo "$HOME/.local/bin" >> $GITHUB_PATH
+          export PATH="$HOME/.local/bin:$PATH"
+
+      - name: Setting up snfoundry
+        uses: foundry-rs/setup-snfoundry@v3
+
+      - name: Running tests
+        run: scarb test
+
+
+  nextjs-build-and-test:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./web
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+          cache: "npm"
+          cache-dependency-path: "./web/package-lock.json"
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Run tests
+        run: npm test
+
+      - name: Build
+        run: npm run build
+        env:
+          DATABASE_URL: ${{  secrets.DATABASE_URL }}
+          JWT_SECRET: ${{  secrets.JWT_SECRET }}
+          RABBITMQ_URL: ${{  secrets.RABBITMQ_URL }}
+
+      - name: Cache build output
+        uses: actions/cache@v4
+        with:
+          path: |
+            ./web/.next/cache
+            ./web/.next/static
+          key: ${{ runner.os }}-nextjs-${{ hashFiles('web/package-lock.json') }}-${{ hashFiles('web/**.[jt]sx?') }}
+          restore-keys: |
+            ${{ runner.os }}-nextjs-${{ hashFiles('web/package-lock.json') }}-