laszip: add build-laszip.yml for riscv64 wheels (#1459)

* **Package**: `laszip`
* **Version**: `0.3.0`
* **Source**: https://github.com/tmontaigu/laszip-python
* **Docs**: https://github.com/tmontaigu/laszip-python

Pybind11 bindings over a vendored LASzip C++ library for LiDAR point-cloud (.laz) compression. Upstream publishes no riscv64 wheel.

Mirrors [upstream's `build.yml`](https://github.com/tmontaigu/laszip-python/blob/0.3.0/.github/workflows/build.yml) `wheels` job, narrowed to riscv64 manylinux.

**Differs from upstream**
- Nothing beyond the riscv64 image.

**Testing**
- same as upstream (`import laszip`), plus asserts the compiled `laszip_core` extension and instantiates two classes - `laszip/__init__.py` is a pure-Python re-export shim.

**License**: MIT; vendors LASzip (Apache-2.0) from `src/vendor/`, staged at the root so its licence lands in `dist-info/licenses` alongside the project's own.

Author: luhenry

.github/workflows/build-laszip.yml

@@ -0,0 +1,88 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on the `wheels` job of
+# https://github.com/tmontaigu/laszip-python/blob/0.3.0/.github/workflows/build.yml
+name: Build laszip wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'laszip version to build (git tag, e.g. 0.3.0)'
+        required: true
+        default: '0.3.0'
+  pull_request:
+    paths:
+      - '.github/workflows/build-laszip.yml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '0.3.0' }}-${{ 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 0.3.0 there.
+  LASZIP_VERSION: ${{ inputs.version || '0.3.0' }}
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+
+  build_wheels:
+    needs: [setup]
+    name: Build laszip ${{ inputs.version || '0.3.0' }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        python: ["cp312", "cp313", "cp314", "cp314t"]
+
+    steps:
+      - name: Checkout laszip-python ${{ env.LASZIP_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: tmontaigu/laszip-python
+          ref: ${{ env.LASZIP_VERSION }}
+          persist-credentials: false
+
+      # The vendored LASzip (Apache-2.0) sources live under src/vendor/ rather than
+      # at the project root, so scikit-build-core's default LICEN[CS]E* glob misses
+      # it; stage a copy at the root for the glob to pick up (gotcha 32/44).
+      - name: Stage the vendored LASzip licence
+        run: cp src/vendor/LASzip-*/COPYING.txt LICENSE.laszip-core
+
+      - name: Build wheels
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          output-dir: wheelhouse/
+          only: ${{ matrix.python }}-manylinux_riscv64
+        env:
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          # scikit-build-core fetches cmake/ninja from PyPI when missing on PATH,
+          # and pybind11's headers need pip to resolve.
+          CIBW_ENVIRONMENT: PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
+          # laszip/__init__.py is a pure-Python `from .laszip_core import *` shim;
+          # probe the compiled extension module directly (gotcha 56).
+          CIBW_TEST_COMMAND: >-
+            python -c "import laszip.laszip_core as m; assert m.__file__.endswith('.so'), m.__file__; import laszip; laszip.LasZipHeader(); laszip.LasZipDll()"
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: laszip-${{ env.LASZIP_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish laszip ${{ inputs.version || '0.3.0' }}
+    needs: [setup, build_wheels]
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    with:
+      artifact-pattern: laszip-${{ inputs.version || '0.3.0' }}-*-manylinux_riscv64