Optimize CI by caching uv virtual environment and speed the testing

.github/workflows/install-and-test.yml

@@ -44,13 +44,29 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Set up Python 3.13
+        id: setup-python
         uses: actions/setup-python@v6
         with:
           python-version: 3.13
+          cache: 'pip'
 
-      - name : Install uv (if applicable)
+      - name: Install uv (if applicable)
         if: matrix.package_manager == 'uv'
         uses: astral-sh/setup-uv@v7
+        with:
+          enable-cache: true
+
+      - name: Cache venv (uv only)
+        if: matrix.package_manager == 'uv'
+        id: cache-venv
+        uses: actions/cache@v4
+        with:
+          path: .venv
+          key: venv-v1-${{ runner.os }}-${{ matrix.device }}-py${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('pyproject.toml') }}
+          restore-keys: |
+            venv-v1-${{ runner.os }}-${{ matrix.device }}-py${{ steps.setup-python.outputs.python-version }}-
+
+
 
       - name: Create virtual environment (pip GPU)
         if: matrix.package_manager == 'pip' && matrix.device == 'gpu'
@@ -77,14 +93,19 @@ jobs:
           python -m pip install --group dev .
 
       - name: Setup environment with uv (if applicable)
-        if: matrix.package_manager == 'uv'
+        if: matrix.package_manager == 'uv' && steps.cache-venv.outputs.cache-hit != 'true'
         run: |
           uv venv --no-project
-          source .venv/bin/activate
           uv pip install torch --index-url ${{ matrix.torch_index }}
           uv pip install --group dev -e .
-          uv pip list
-          echo "$PWD/.venv/bin" >> $GITHUB_PATH
+
+      - name: Add venv to PATH (uv)
+        if: matrix.package_manager == 'uv'
+        run: echo "$PWD/.venv/bin" >> $GITHUB_PATH
+
+      - name: Debug installed packages
+        if: matrix.package_manager == 'uv'
+        run: uv pip list
 
       - name: Print torch version
         run: |