dracopy: add build-dracopy.yml for riscv64 wheels

.github/workflows/build-dracopy.yml

@@ -0,0 +1,109 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on the `build_wheels` job of
+# https://github.com/seung-lab/DracoPy/blob/2.0.0/.github/workflows/build_aarch64.yml
+name: Build dracopy wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'DracoPy version to build (git tag equals the version, e.g. 2.0.0)'
+        required: true
+        default: '2.0.0'
+  pull_request:
+    paths:
+      - '.github/workflows/build-dracopy.yml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '2.0.0' }}-${{ 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 2.0.0 there.
+  DRACOPY_VERSION: ${{ inputs.version || '2.0.0' }}
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+
+  build_wheels:
+    needs: [setup]
+    name: Build dracopy ${{ inputs.version || '2.0.0' }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 90
+    strategy:
+      fail-fast: false
+      matrix:
+        python:
+          - "cp312"
+          - "cp313"
+          - "cp314"
+          - "cp314t"
+
+    steps:
+      - name: Checkout DracoPy ${{ env.DRACOPY_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: seung-lab/DracoPy
+          ref: ${{ env.DRACOPY_VERSION }}
+          # Google's Draco mesh compression library is a submodule and is
+          # statically linked (libdraco.a) into the DracoPy extension.
+          submodules: recursive
+          persist-credentials: false
+
+      - name: Build wheels
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          output-dir: wheelhouse/
+          only: ${{ matrix.python }}-manylinux_riscv64
+        env:
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          # Mirrors upstream's own CIBW_BEFORE_BUILD (build_aarch64.yml); the
+          # submodule is already present via `submodules: recursive` above, so
+          # the `git submodule` calls upstream runs here are dropped. cmake and
+          # cython are setup.py setup_requires, not pyproject.toml build-system
+          # requires, so they need to already be importable/on PATH before
+          # setup.py runs, isolated build or not.
+          CIBW_BEFORE_BUILD: pip install "cmake>=3.30.2" cython numpy scikit-build setuptools wheel
+          # numpy and cmake have riscv64 wheels only on our registry.
+          CIBW_ENVIRONMENT: PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
+          CIBW_TEST_REQUIRES: pytest numpy
+          CIBW_TEST_SOURCES: tests.py pytest.ini testdata_files
+          CIBW_TEST_COMMAND: cd {project} && python -m pytest -v tests.py
+          # numpy has no riscv64 wheel on public PyPI; keep pip on our registry's copy.
+          CIBW_TEST_ENVIRONMENT: PIP_ONLY_BINARY=numpy
+
+      - name: Check wheel contents
+        run: |
+          python3 - wheelhouse/*.whl <<'EOF'
+          import sys, zipfile
+          path = sys.argv[1]
+          names = zipfile.ZipFile(path).namelist()
+          exts = [n for n in names if n.endswith(".so")]
+          assert exts and all("DracoPy" in n for n in exts), exts
+          licences = {n.split(".dist-info/licenses/", 1)[1] for n in names
+                      if ".dist-info/licenses/" in n and not n.endswith("/")}
+          assert licences == {"LICENSE"}, licences
+          EOF
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: dracopy-${{ env.DRACOPY_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish dracopy ${{ inputs.version || '2.0.0' }}
+    needs: [setup, build_wheels]
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    with:
+      artifact-pattern: dracopy-${{ inputs.version || '2.0.0' }}-*-manylinux_riscv64