Replace pip with uv in GitHub workflows and nox (onnx#245)

Migrates all GitHub workflow jobs from `pip` to `uv` for faster package
installation and better caching. Also configures nox to use uv as the
default virtual environment backend.

## Changes

- **Package installation**: Replace `python -m pip install` and `pip
install` with `uv pip install --system`
- **Workflow setup**: Add `astral-sh/setup-uv@v5` with `enable-cache:
true` to all jobs requiring package installation
- **Consistency**: Update `pip list` to `uv pip list` in version
checking steps
- **Cleanup**: Remove `--upgrade pip setuptools` commands and duplicate
checkout action in pages.yml
- **Nox configuration**: Set `nox.options.default_venv_backend = "uv"`
in noxfile.py and add `NOX_DEFAULT_VENV_BACKEND=uv` environment variable
to test job

## Example

```yaml
# Before
- name: Install dependencies
  run: |
    python -m pip install --upgrade pip setuptools
    python -m pip install -r requirements-dev.txt

# After
- name: Install uv
  uses: astral-sh/setup-uv@v5
  with:
    enable-cache: true
- name: Install dependencies
  run: uv pip install --system -r requirements-dev.txt
```

## Files Modified

- `.github/workflows/main.yml` - test, build_docs, and build jobs
- `.github/workflows/lint.yml` - enforce-style job
- `.github/workflows/pages.yml` - deploy job
- `.github/workflows/copilot-setup-steps.yml` - setup job
- `noxfile.py` - configure uv as default venv backend

<!-- START COPILOT CODING AGENT SUFFIX -->



<details>

<summary>Original prompt</summary>

> Use uv to replace pip install in github workflows


</details>



<!-- START COPILOT CODING AGENT TIPS -->
---

✨ Let Copilot coding agent [set things up for
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Co-authored-by: justinchuby <11205048+justinchuby@users.noreply.github.com>
Co-authored-by: Justin Chu <justinchuby@users.noreply.github.com>

Author: Copilot

.github/workflows/copilot-setup-steps.yml

@@ -32,7 +32,9 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: "3.12"
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
       - name: Install Python build dependencies
         run: |
-          python -m pip install -r requirements-dev.txt
-          python -m pip install -e .
+          uv pip install --system -r requirements-dev.txt
+          uv pip install --system -e .

.github/workflows/lint.yml

@@ -48,14 +48,16 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: "3.12"
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+        with:
+          enable-cache: true
       - name: Install onnx-ir
         run: |
           # Install dependencies
-          python -m pip install --upgrade pip
-          python -m pip install --upgrade setuptools
-          python -m pip install -r requirements-dev.txt
+          uv pip install --system -r requirements-dev.txt
           # Install packages
-          python -m pip install -e .
+          uv pip install --system -e .
           lintrunner init
       - name: Run lintrunner on all files
         run: |

.github/workflows/main.yml

@@ -51,11 +51,15 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
       - name: Install nox
-        run: python -m pip install nox
+        run: uv pip install --system nox
       - name: Pull Test Data
         run: git lfs pull
       - name: Run tests
+        env:
+          NOX_DEFAULT_VENV_BACKEND: uv
         run: nox -t ${{ matrix.nox-tag }} --forcecolor -- --cov=src/onnx_ir --cov-report=xml --cov-append --cov-branch -n=auto --junitxml junit.xml
       - name: Upload coverage to Codecov
         if: always()
@@ -80,19 +84,18 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: "3.12"
-          cache: pip
-          cache-dependency-path: "**/requirements-dev.txt"
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip setuptools
-          python -m pip install -r requirements-dev.txt
+          uv pip install --system -r requirements-dev.txt
       - name: Versions
         run: |
-          pip list | grep numpy
-          pip list | grep onnx
-          pip list | grep torch
+          uv pip list | grep numpy
+          uv pip list | grep onnx
+          uv pip list | grep torch
       - name: Install package
-        run: pip install .
+        run: uv pip install --system .
       - name: Build documentation
         run: python -m sphinx docs dist/html
 
@@ -108,9 +111,11 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: "3.12"
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
       - name: Install Python build dependencies
         run: |
-          python -m pip install --upgrade pip build wheel
+          uv pip install --system build wheel
       - name: Build wheels
         run: |
           python -m build

.github/workflows/pages.yml

@@ -32,13 +32,15 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: "3.10"
-      - uses: actions/checkout@v5
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+        with:
+          enable-cache: true
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip setuptools
-          python -m pip install -r requirements-dev.txt
+          uv pip install --system -r requirements-dev.txt
       - name: Install package
-        run: pip install .
+        run: uv pip install --system .
       - name: Build documentation
         run: python -m sphinx docs dist/html
       - name: Upload documentation archive

noxfile.py

@@ -9,6 +9,7 @@
 import nox
 
 nox.options.error_on_missing_interpreters = False
+nox.options.default_venv_backend = "uv"
 
 
 COMMON_TEST_DEPENDENCIES = (
@@ -54,7 +55,7 @@ def test(session):
     )
     session.install(ONNXSCRIPT, "--no-deps")
     session.install(".", "--no-deps")
-    session.run("pip", "list")
+    session.run("uv", "pip", "list")
     session.run("pytest", "src", "--doctest-modules", *session.posargs)
     session.run("pytest", "tests", *session.posargs)
 
@@ -66,7 +67,7 @@ def test_onnx_weekly(session):
     session.install("-r", "requirements/ci/requirements-onnx-weekly.txt")
     session.install(ONNXSCRIPT, "--no-deps")
     session.install(".", "--no-deps")
-    session.run("pip", "list")
+    session.run("uv", "pip", "list")
     session.run("pytest", "src", "--doctest-modules", *session.posargs)
     session.run("pytest", "tests", *session.posargs)
 
@@ -79,7 +80,7 @@ def test_torch_nightly(session):
     session.install("-r", "requirements/ci/requirements-pytorch-nightly.txt")
     session.install(ONNXSCRIPT, "--no-deps")
     session.install(".", "--no-deps")
-    session.run("pip", "list")
+    session.run("uv", "pip", "list")
     session.run("pytest", "src", "--doctest-modules", *session.posargs)
     session.run("pytest", "tests", *session.posargs)