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CI/BLD: Add development build test workflow #31842

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Add development build test workflow
scottshambaugh Jun 5, 2026
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Code review updates
scottshambaugh Jun 5, 2026
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129 changes: 129 additions & 0 deletions .github/workflows/dev_build.yml
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---
# Exercises the documented build paths from doc/devel/development_setup.rst.
name: Dev builds

concurrency:
group: ${{ github.workflow }}-${{ github.event.number }}-${{ github.event.ref }}
cancel-in-progress: true

on:
push:
branches:
- main
- v[0-9]+.[0-9]+.x
pull_request:
workflow_dispatch:

permissions: {}

jobs:
build:
permissions:
contents: read
name: "Dev builds on ${{ matrix.os }}"
runs-on: ${{ matrix.os }}
strategy:
fail-fast: false
matrix:
os: [ubuntu-latest, macos-latest, windows-latest]
defaults:
run:
# Login shell so the conda environment can be activated in its step.
shell: bash -el {0}
steps:
- uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
with:
fetch-depth: 0 # full history so setuptools-scm can determine the version
persist-credentials: false

- uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
with:
python-version: '3.13'
cache: pip
cache-dependency-path: pyproject.toml

- uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
with:
enable-cache: true

- uses: mamba-org/setup-micromamba@d7c9bd84e824b79d2af72a2d4196c7f4300d3476 # v3.0.0
with:
init-shell: bash
cache-downloads: true

- name: Build with venv + pip
id: venv_pip
continue-on-error: true
run: |
rm -rf build
python -m venv .venv-pip
source .venv-pip/bin/activate 2>/dev/null || source .venv-pip/Scripts/activate
python -m pip install -U pip
python -m pip install --group dev
# Strawberry Perl's gcc on PATH shadows MSVC, so --vsenv forces MSVC.
VSENV=()
[ "$RUNNER_OS" = Windows ] && VSENV=(--config-settings=setup-args=--vsenv)
python -m pip install --verbose --no-build-isolation --group dev "${VSENV[@]}" --editable .
python -c "import matplotlib; print(matplotlib.__file__, matplotlib.__version__)"

- name: Build with conda + pip
id: conda
continue-on-error: true
run: |
rm -rf build
# Create the env here rather than via setup-micromamba's
# environment-file input, which crashes on environment.yml's
# nbconvert[execute] spec.
micromamba create -y -n mpl-dev -f environment.yml
micromamba activate mpl-dev
# conda's MSVC setup doesn't run under bash, so --vsenv forces MSVC.
VSENV=()
[ "$RUNNER_OS" = Windows ] && VSENV=(--config-settings=setup-args=--vsenv)
python -m pip install --verbose --no-build-isolation --group dev "${VSENV[@]}" --editable .
python -c "import matplotlib; print(matplotlib.__file__, matplotlib.__version__)"

- name: Build with uv pip
id: uv_pip
continue-on-error: true
run: |
rm -rf build
uv venv --python 3.13 .venv-uvpip
source .venv-uvpip/bin/activate 2>/dev/null || source .venv-uvpip/Scripts/activate
uv pip install --group dev
VSENV=()
[ "$RUNNER_OS" = Windows ] && VSENV=(-C setup-args=--vsenv)
uv pip install --verbose --no-build-isolation --group dev "${VSENV[@]}" --editable .
python -c "import matplotlib; print(matplotlib.__file__, matplotlib.__version__)"

- name: Build with uv sync
id: uv_sync
continue-on-error: true
env:
UV_PROJECT_ENVIRONMENT: .venv-uvsync
run: |
rm -rf build
# Build separately without isolation, since meson-python editable breaks if
# its build env is deleted.
uv sync --python 3.13 --group dev --no-install-project
source .venv-uvsync/bin/activate 2>/dev/null || source .venv-uvsync/Scripts/activate
VSENV=()
[ "$RUNNER_OS" = Windows ] && VSENV=(-C setup-args=--vsenv)
uv pip install --verbose --no-build-isolation --group dev "${VSENV[@]}" --editable .
python -c "import matplotlib; print(matplotlib.__file__, matplotlib.__version__)"

- name: Summary
if: always()
env:
VENV_PIP_OUTCOME: ${{ steps.venv_pip.outcome }}
CONDA_OUTCOME: ${{ steps.conda.outcome }}
UV_PIP_OUTCOME: ${{ steps.uv_pip.outcome }}
UV_SYNC_OUTCOME: ${{ steps.uv_sync.outcome }}
run: |
echo "venv + pip : $VENV_PIP_OUTCOME"
echo "conda : $CONDA_OUTCOME"
echo "uv pip : $UV_PIP_OUTCOME"
echo "uv sync : $UV_SYNC_OUTCOME"
test "$VENV_PIP_OUTCOME" = success \
&& test "$CONDA_OUTCOME" = success \
&& test "$UV_PIP_OUTCOME" = success \
&& test "$UV_SYNC_OUTCOME" = success
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