xatlas: add build-xatlas.yml for riscv64 wheels

.github/workflows/build-xatlas.yml

@@ -0,0 +1,104 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on the `build_wheels` job of
+# https://github.com/mworchel/xatlas-python/blob/v0.0.11/.github/workflows/wheels.yml
+name: Build xatlas wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'xatlas version to build (git tag without the leading v, e.g. 0.0.11)'
+        required: true
+        default: '0.0.11'
+  pull_request:
+    paths:
+      - '.github/workflows/build-xatlas.yml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '0.0.11' }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  # `inputs.version` is empty on pull_request events; default to 0.0.11 there.
+  XATLAS_VERSION: ${{ inputs.version || '0.0.11' }}
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+
+  build_wheels:
+    needs: [setup]
+    name: Build xatlas ${{ inputs.version || '0.0.11' }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 90
+    strategy:
+      fail-fast: false
+      matrix:
+        # numpy and scipy (test-only deps) have no musllinux riscv64 wheel on
+        # our registry; manylinux only.
+        python: ["cp312", "cp313", "cp314", "cp314t"]
+
+    steps:
+      - name: Checkout xatlas-python v${{ env.XATLAS_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: mworchel/xatlas-python
+          ref: v${{ env.XATLAS_VERSION }}
+          submodules: true
+          persist-credentials: false
+
+      # extern/xatlas (jpcy/xatlas) and extern/pybind11 are compiled into the
+      # wheel, but upstream's own wheel ships only its own LICENSE. Stage
+      # theirs at the root for scikit-build-core's default
+      # wheel.license-files glob to pick up.
+      - name: Stage the vendored dependencies' licences
+        run: |
+          cp extern/xatlas/LICENSE LICENSE.xatlas
+          cp extern/pybind11/LICENSE LICENSE.pybind11
+
+      - name: Build wheels
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          output-dir: wheelhouse/
+          only: ${{ matrix.python }}-manylinux_riscv64
+        env:
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          CIBW_ENVIRONMENT: PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
+          # numpy and scipy have no riscv64 wheels on public PyPI; keep pip
+          # on our registry's copies for the test extras.
+          CIBW_TEST_ENVIRONMENT: PIP_ONLY_BINARY=numpy,scipy
+
+      - name: Check wheel contents
+        run: |
+          python3 - wheelhouse/*.whl <<'EOF'
+          import sys, zipfile
+          for path in sys.argv[1:]:
+              names = zipfile.ZipFile(path).namelist()
+              assert any(n.endswith(".so") for n in names), (path, names)
+              licences = {n.rsplit("/", 1)[-1] for n in names
+                          if ".dist-info/licenses/" in n} - {""}
+              assert licences == {"LICENSE", "LICENSE.xatlas", "LICENSE.pybind11"}, (path, licences)
+              print(path, "ok")
+          EOF
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: xatlas-${{ env.XATLAS_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish xatlas ${{ inputs.version || '0.0.11' }}
+    needs: [setup, build_wheels]
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    with:
+      artifact-pattern: xatlas-${{ inputs.version || '0.0.11' }}-*-manylinux_riscv64