ci: add nox utilities for conditional session execution instead of using github actions

.github/workflows/code-quality.yml

@@ -13,8 +13,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
-      with:
-        fetch-depth: 0  # Use a deep clone to get the correct version from tags
 
     - name: Set up Python
       uses: actions/setup-python@v5

.github/workflows/daily-ci.yml

@@ -20,8 +20,7 @@ jobs:
       python-versions: ${{ steps.get-versions.outputs.python-versions }}
     steps:
     - uses: actions/checkout@v4
-      with:
-        fetch-depth: 0  # Use a deep clone to get the correct version from tags
+
     - id: get-versions
       uses: ./.github/actions/get-python-versions
 
@@ -41,8 +40,6 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
-      with:
-        fetch-depth: 0  # Use a deep clone to get the correct version from tags
 
     - name: Install uv and set the python version
       uses: astral-sh/setup-uv@v5
@@ -53,12 +50,11 @@ jobs:
 
     - name: Run CPU tests for '${{ matrix.gt4py-module }}' with '${{ matrix.dependencies-strategy }}' resolution strategy
       env:
-        NUM_PROCESSES: auto
         UV_RESOLUTION: ${{ matrix.dependencies-strategy }}
         # Force a specific compiler for setuptools/distutils (used in gt4py.cartesian)
         CXX: g++
         CC: gcc
-      run: uv run nox -s 'test_${{ matrix.gt4py-module }}-${{ matrix.python-version }}' -t 'cpu'
+      run: uv run --script noxfile.py -s 'test_${{ matrix.gt4py-module }}-${{ matrix.python-version }}' -t 'cpu'
 
     - name: Notify slack
       if: ${{ failure() }}
@@ -75,7 +71,7 @@ jobs:
                 "type": "section",
                 "text": {
                   "type": "mrkdwn",
-                  "text": "Failed tests: <https://github.com/GridTools/gt4py/actions/runs/${{ github.run_id }}|${{ github.workflow }}: **${{ matrix.gt4py-module }} (CPU)** for **Python-${{ matrix.python-version }}** with **'${{ matrix.dependencies-strategy }}' uv resolution strategy**.>"
+                  "text": "Failed tests: <https://github.com/GridTools/gt4py/actions/runs/${{ github.run_id }}|${{ github.workflow }}: ${{ matrix.gt4py-module }} (CPU) for Python-${{ matrix.python-version }} with '${{ matrix.dependencies-strategy }}' uv resolution strategy.>"
                 }
               }
             ]

.github/workflows/test-cartesian.yml

@@ -7,12 +7,6 @@ on:
   pull_request:
     branches:
     - main
-    paths-ignore:  # Skip when only gt4py.next or doc files have been updated
-    - "src/gt4py/next/**"
-    - "tests/next_tests/**"
-    - "examples/**"
-    - "*.md"
-    - "*.rst"
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
@@ -29,7 +23,7 @@ jobs:
     - id: get-versions
       uses: ./.github/actions/get-python-versions
 
-  # Main job that runs the tests
+  # Test-running job
   test-cartesian:
     needs: get-python-versions
     strategy:
@@ -42,6 +36,8 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0  # Use a deep clone to get target PR branch
 
     - name: Install uv and set the python version
       uses: astral-sh/setup-uv@v5
@@ -52,9 +48,10 @@ jobs:
 
     - name: Run CPU 'cartesian' tests with nox
       env:
-        NUM_PROCESSES: auto
+        CI_NOX_RUN_ONLY_IF_CHANGED_FROM: "origin/${{ github.base_ref }}"
+        CI_NOX_VERBOSE: 1
         # Force a specific compiler for setuptools/distutils
         CXX: g++
         CC: gcc
       shell: bash
-      run: uv run nox -s 'test_cartesian-${{ matrix.python-version }}(${{ matrix.codegen-factor }}, cpu)'
+      run: uv run --script noxfile.py -s 'test_cartesian-${{ matrix.python-version }}(${{ matrix.codegen-factor }}, cpu)'

.github/workflows/test-eve.yml

@@ -7,13 +7,6 @@ on:
   pull_request:
     branches:
     - main
-    paths:  # Run when gt4py.eve files (or package settings) are changed
-    - "src/gt4py/eve/**"
-    - "tests/eve_tests/**"
-    - ".github/workflows/**"
-    - "*.lock"
-    - "*.toml"
-    - "*.yml"
 
 jobs:
   # First job to read Python versions from .python-versions file
@@ -26,6 +19,7 @@ jobs:
     - id: get-versions
       uses: ./.github/actions/get-python-versions
 
+  # Test-running job
   test-eve:
     needs: get-python-versions
     strategy:
@@ -37,6 +31,8 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0  # Use a deep clone to get target PR branch
 
     - name: Install uv and set the python version
       uses: astral-sh/setup-uv@v5
@@ -47,6 +43,7 @@ jobs:
 
     - name: Run 'eve' tests with nox
       env:
-        NUM_PROCESSES: auto
+        CI_NOX_RUN_ONLY_IF_CHANGED_FROM: "origin/${{ github.base_ref }}"
+        CI_NOX_VERBOSE: 1
       shell: bash
-      run: uv run nox -s test_eve-${{ matrix.python-version }}
+      run: uv run --script noxfile.py -s test_eve-${{ matrix.python-version }}

.github/workflows/test-examples.yml

@@ -19,6 +19,7 @@ jobs:
     - id: get-versions
       uses: ./.github/actions/get-python-versions
 
+  # Test-running job
   test-notebooks:
     needs: get-python-versions
     strategy:
@@ -39,7 +40,5 @@ jobs:
         python-version: ${{ matrix.python-version }}
 
     - name: Run 'docs' nox session
-      env:
-        NUM_PROCESSES: auto
       shell: bash
-      run: uv run nox -s 'test_examples-${{ matrix.python-version }}'
+      run: uv run --script noxfile.py -s 'test_examples-${{ matrix.python-version }}'

.github/workflows/test-next.yml

@@ -7,12 +7,6 @@ on:
   pull_request:
     branches:
     - main
-    paths-ignore:  # Skip when only gt4py.cartesian or doc files have been updated
-    - "src/gt4py/cartesian/**"
-    - "tests/cartesian_tests/**"
-    - "examples/**"
-    - "*.md"
-    - "*.rst"
 
 jobs:
   # First job to read Python versions from .python-versions file
@@ -25,6 +19,7 @@ jobs:
     - id: get-versions
       uses: ./.github/actions/get-python-versions
 
+  # Test-running job
   test-next:
     needs: get-python-versions
     strategy:
@@ -38,6 +33,8 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0  # Use a deep clone to get target PR branch
 
     - name: Install uv and set the python version
       uses: astral-sh/setup-uv@v5
@@ -48,6 +45,7 @@ jobs:
 
     - name: Run CPU 'next' tests with nox
       env:
-        NUM_PROCESSES: auto
+        CI_NOX_RUN_ONLY_IF_CHANGED_FROM: "origin/${{ github.base_ref }}"
+        CI_NOX_VERBOSE: 1
       shell: bash
-      run: uv run nox -s 'test_next-${{ matrix.python-version }}(${{ matrix.codegen-factor }}, cpu, ${{ matrix.mesh-factor }})'
+      run: uv run --script noxfile.py -s 'test_next-${{ matrix.python-version }}(${{ matrix.codegen-factor }}, cpu, ${{ matrix.mesh-factor }})'

.github/workflows/test-package.yml

@@ -19,6 +19,7 @@ jobs:
     - id: get-versions
       uses: ./.github/actions/get-python-versions
 
+  # Test-running job
   test-package:
     needs: get-python-versions
     strategy:
@@ -39,7 +40,5 @@ jobs:
         python-version: ${{ matrix.python-version }}
 
     - name: Run 'package' tests with nox
-      env:
-        NUM_PROCESSES: auto
       shell: bash
-      run: uv run nox -s test_package-${{ matrix.python-version }}
+      run: uv run --script noxfile.py -s test_package-${{ matrix.python-version }}