modernize build system

.github/workflows/cibuildwheel_config.toml

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+[tool.cibuildwheel]
+skip = "cp36-*" # scikit-build-core requires >=3.7
+build-verbosity = 3
+
+[tool.cibuildwheel.linux]
+before-all = [
+    "yum remove -y cmake",
+]
+
+# musllinux builds on an Alpinx Linux image, no need to mess with cmake there
+[[tool.cibuildwheel.overrides]]
+select = "*-musllinux*"
+before-all = ""

.github/workflows/publish.yml

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+name: Build and Publish
+
+# NOTE: build logic is duplicated here and in test_build.yml
+
+# Run on the main branch for commits only
+on:
+  push:
+    branches:     
+      - master
+
+jobs:
+  build_wheels:
+
+    # only run if the most recent commit contains '[ci publish]'
+    if: "contains(github.event.head_commit.message, '[ci publish]')"
+
+    strategy:
+      matrix:
+        # macos-13 is an intel runner, macos-14 is apple silicon
+        os: [ubuntu-latest, windows-latest, macos-13, macos-14]
+
+    name: Build wheels ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: 'recursive'
+
+      - name: Package source distribution
+        if: runner.os == 'Linux'
+        run: |
+          python -m pip install build
+          python -m build --sdist
+
+      - name: Run cibuildwheel
+        uses: pypa/cibuildwheel@v2.21 
+        with:
+          config-file: ".github/workflows/cibuildwheel_config.toml"
+
+      - name: Copy source distribution into wheelhouse
+        if: runner.os == 'Linux'
+        run: mv dist/*.tar.gz wheelhouse/
+
+      # Upload binaries to the github artifact store
+      - name: Upload wheels
+        uses: actions/upload-artifact@v4
+        with:
+          name: cibw-wheels-${{ matrix.os }}
+          path: |
+            ./wheelhouse/*.whl 
+            ./wheelhouse/*.tar.gz 
+          overwrite: true
+
+  # Push the resulting binaries to pypi on a tag starting with 'v'
+  upload_pypi:
+    name: Upload release to PyPI
+
+    # only run if the most recent commit contains '[ci publish]'
+    if: "contains(github.event.head_commit.message, '[ci publish]')"
+
+    needs: [build_wheels]
+    runs-on: ubuntu-latest
+    environment:
+      name: pypi
+      url: https://pypi.org/p/potpourri3d
+    permissions: # we authenticate via PyPI's 'trusted publisher' workflow, this permission is required
+      id-token: write
+    steps:
+      - name: Download built wheels artifact # downloads from the jobs storage from the previous step
+        uses: actions/download-artifact@v4.1.7
+        with:
+          # omitting the `name: ` field downloads all artifacts from this workflow
+          path: dist
+
+      - name: List downloaded files from artifact
+        run: ls dist | cat  # piping through cat prints one per line
+
+        # dist directory has subdirs from the different jobs, merge them into one directory and delete
+        # the empty leftover dirs 
+      - name: Flatten directory 
+        run: find dist -mindepth 2 -type f -exec mv -t dist {} + && find dist -type d -empty -delete
+
+      - name: List downloaded files from artifact after flatten
+        run: ls dist | cat  # piping through cat prints one per line
+
+      - name: Publish package to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        # with:
+          # To test: repository_url: https://test.pypi.org/legacy/
+

.github/workflows/test_build.yml

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+name: Test Build
+
+# NOTE: build logic is duplicated here and in publish.yml
+
+# Run on the master branch commit push and PRs to master (note conditional below)
+on:
+  push:
+    branches:    
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build_wheels:
+
+    # Only run if the commit message contains '[ci build]'
+    if: "contains(toJSON(github.event.commits.*.message), '[ci build]') || contains(toJSON(github.event.pull_request.title), '[ci build]')"
+
+    strategy:
+      fail-fast: false
+      matrix:
+        # macos-13 is an intel runner, macos-14 is apple silicon
+        os: [ubuntu-latest, windows-latest, macos-13, macos-14]
+
+    name: Build wheels ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: 'recursive'
+
+      - name: Package source distribution
+        if: runner.os == 'Linux'
+        run: |
+          python -m pip install build
+          python -m build --sdist
+
+      - name: Run cibuildwheel
+        uses: pypa/cibuildwheel@v2.21
+        with:
+          config-file: ".github/workflows/cibuildwheel_config.toml"
+
+      # Upload binaries to the github artifact store
+      - name: Upload wheels
+        uses: actions/upload-artifact@v4
+        with:
+          name: cibw-wheels-${{ matrix.os }}
+          path: |
+            ./wheelhouse/*.whl 
+            ./wheelhouse/*.tar.gz 
+          overwrite: true

pyproject.toml

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+[project]
+name = "potpourri3d"
+version = "1.2.0"
+description = "An invigorating blend of 3D geometry tools in Python." 
+readme = "README.md"
+license.file = "LICENSE"
+authors = [
+  { name = "Nicholas Sharp", email = "nmwsharp@gmail.com" },
+]
+maintainers = [
+  {  name = "Nicholas Sharp", email = "nmwsharp@gmail.com" },
+]
+classifiers = [
+  "Development Status :: 5 - Production/Stable",
+  "License :: OSI Approved :: MIT License",
+  "Programming Language :: Python :: 3",
+]
+requires-python = ">=3.7"
+
+dependencies = [
+  "numpy",
+  "scipy"
+]
+
+[project.urls]
+Homepage = "https://github.com/nmwsharp/potpourri3d"
+
+[build-system]
+requires = ["scikit-build-core"]
+build-backend = "scikit_build_core.build"
+
+[tool.scikit-build]
+build.verbose = true
+logging.level = "INFO"