feat: Add pixi environment (#534)

* feat: Add pixi environment

* Add pixi manifest pixi.toml for Linux x86, macOS arm64, Windows 64.

* ci: Update CI workflow and unify to one

* Enable workflow dispatch.
* Add concurrency limits.
* Use pixi for CI workflow.
* Unify to a single workflow for all OS tested

* feat: Add pixi lock file

* Ensure tensorflow-cpu installed on Windows

* fix package check

* fix package check

* simplification plus uv and pip runners

* some fixes to pixi and pip

* create pixi.lock

* fix pixi.lock issue

* another attempt trying to fix get_packages

* another attempt trying to fix get_packages

* clean up python_environment_check.py

* updated runner and docs

* use bash

* proper env activiation

* proper env activiation

---------

Co-authored-by: rasbt <mail@sebastianraschka.com>

.github/workflows/basic-tests-windows-uv-pip.yml

@@ -0,0 +1,63 @@
+name: Code tests Windows (uv/pip)
+
+on:
+  push:
+    branches: [ main ]
+    paths:
+      - '**/*.py'
+      - '**/*.ipynb'
+      - '**/*.yaml'
+      - '**/*.yml'
+      - '**/*.sh'
+  pull_request:
+    branches: [ main ]
+    paths:
+      - '**/*.py'
+      - '**/*.ipynb'
+      - '**/*.yaml'
+      - '**/*.yml'
+      - '**/*.sh'
+
+jobs:
+  test:
+    runs-on: windows-latest
+
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
+
+      - name: Install dependencies
+        shell: bash
+        run: |
+          export PATH="$HOME/.local/bin:$PATH"
+          pip install --upgrade pip
+          pip install uv
+          uv venv --python=python3.10
+          source .venv/Scripts/activate
+          pip install -r requirements.txt  # because of dependency issue on Windows when using `uv pip`
+          pip install tensorflow-io-gcs-filesystem==0.31.0  # Explicit for Windows
+          pip install -r ch05/07_gpt_to_llama/tests/test-requirements-extra.txt
+          pip install pytest-ruff nbval
+
+      - name: Run Python Tests
+        shell: bash
+        run: |
+          source .venv/Scripts/activate
+          pytest --ruff setup/02_installing-python-libraries/tests.py
+          pytest --ruff ch04/01_main-chapter-code/tests.py
+          pytest --ruff ch05/01_main-chapter-code/tests.py
+          pytest --ruff ch05/07_gpt_to_llama/tests/tests.py
+          pytest --ruff ch06/01_main-chapter-code/tests.py
+
+      - name: Run Jupyter Notebook Tests
+        shell: bash
+        run: |
+          source .venv/Scripts/activate
+          pytest --ruff --nbval ch02/01_main-chapter-code/dataloader.ipynb
+          pytest --ruff --nbval ch03/01_main-chapter-code/multihead-attention.ipynb
+          pytest --ruff --nbval ch02/04_bonus_dataloader-intuition/dataloader-intuition.ipynb