feat: enhance CI workflow with Nixpacks and Railpack installation

- Added steps to install Nixpacks and Railpack in the CI workflow for testing jobs.
- Updated the PATH to include build tools for better accessibility during the build process.
- Improved Vitest configuration to ensure proper TypeScript path resolution.

.github/workflows/pull-request.yml

@@ -20,6 +20,25 @@ jobs:
         with:
           node-version: 20.16.0
           cache: "pnpm"
+      
+      - name: Install Nixpacks
+        if: matrix.job == 'test'
+        run:  |
+          export NIXPACKS_VERSION=1.39.0
+          curl -sSL https://nixpacks.com/install.sh | bash
+          echo "Nixpacks installed $NIXPACKS_VERSION"
+      
+      - name: Install Railpack
+        if: matrix.job == 'test'
+        run:  |
+          export RAILPACK_VERSION=0.15.0
+          curl -sSL https://railpack.com/install.sh | bash
+          echo "Railpack installed $RAILPACK_VERSION"
+      
+      - name: Add build tools to PATH
+        if: matrix.job == 'test'
+        run: echo "$HOME/.local/bin" >> $GITHUB_PATH
+      
       - run: pnpm install --frozen-lockfile
       - run: pnpm server:build
       - run: pnpm ${{ matrix.job }}