feat: add caching for Node modules in GitHub Actions workflow

Author: mrepol742

.github/workflows/build.yml

@@ -28,6 +28,15 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: 20
+      - name: Cache Node modules
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.npm
+            ${{ github.workspace }}/.next/cache
+          key: ${{ runner.os }}-nextjs-${{ hashFiles('**/package-lock.json') }}-${{ hashFiles('**/*.js', '**/*.jsx', '**/*.ts', '**/*.tsx') }}
+          restore-keys: |
+            ${{ runner.os }}-nextjs-${{ hashFiles('**/package-lock.json') }}-
       - name: Build
         run: |
           npm ci