markdown-it-pyrs: add build-markdown-it-pyrs.yml for riscv64 wheels (#1382)

* **Package**: `markdown-it-pyrs`
* **Version**: `0.4.0`
* **Source**: https://github.com/chrisjsewell/markdown-it-pyrs
* **Docs**: https://github.com/chrisjsewell/markdown-it-pyrs

Compiles the PyO3 binding for `markdown-it.rs`, a CommonMark/GFM Markdown parser. Upstream publishes no riscv64 wheel.

Mirrors the `linux` job of [upstream's `CI.yml`](https://github.com/chrisjsewell/markdown-it-pyrs/blob/v0.4.0/.github/workflows/CI.yml), via cibuildwheel instead of `maturin-action` directly.

**Differs from upstream**
- musllinux dropped - rustup ships no riscv64 musl toolchain.

**Matrix**: cp312/cp313 only - pyo3 0.19.2 sets no abi3 feature, predates `Py_GIL_DISABLED` (no cp314t), and segfaults on `.render()` against cp314's changed Unicode object layout (no cp314).

**Testing**
- runs `test_api.py`/`test_cli.py`/`test_fixtures.py`; `bench_html.py`/`bench_tree.py` need the unrelated benchmarking extra, deselected.

**License**: OK

Built on cp312.

Author: luhenry

.github/workflows/build-markdown-it-pyrs.yml

@@ -0,0 +1,92 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on the `linux` job of
+# https://github.com/chrisjsewell/markdown-it-pyrs/blob/v0.4.0/.github/workflows/CI.yml
+name: Build markdown-it-pyrs wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'markdown-it-pyrs version to build (git tag without leading v, e.g. 0.4.0)'
+        required: true
+        default: '0.4.0'
+  pull_request:
+    paths:
+      - '.github/workflows/build-markdown-it-pyrs.yml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '0.4.0' }}-${{ 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 0.4.0 there.
+  MARKDOWN_IT_PYRS_VERSION: ${{ inputs.version || '0.4.0' }}
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+
+  build_wheels:
+    needs: [setup]
+    name: Build markdown-it-pyrs ${{ inputs.version || '0.4.0' }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        # pyo3 0.19.2 sets no abi3 feature, so every interpreter needs its own
+        # build. cp314 segfaults on the first .render() call - pyo3 0.19.2
+        # predates CPython 3.14's changed Unicode object layout (gotcha 322) -
+        # and it also predates Py_GIL_DISABLED entirely, so cp314t is dropped
+        # too.
+        python: ["cp312", "cp313"]
+
+    steps:
+      - name: Checkout markdown-it-pyrs v${{ env.MARKDOWN_IT_PYRS_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: chrisjsewell/markdown-it-pyrs
+          ref: v${{ env.MARKDOWN_IT_PYRS_VERSION }}
+          persist-credentials: false
+
+      - name: Build and test wheel
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          output-dir: wheelhouse/
+        env:
+          CIBW_BUILD: ${{ matrix.python }}-manylinux_riscv64
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          # markdown-it-pyrs ships no [tool.cibuildwheel], so the Rust
+          # toolchain its maturin backend needs is installed in-container here.
+          CIBW_BEFORE_ALL_LINUX: >-
+            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+          CIBW_ENVIRONMENT_LINUX: PATH="$PATH:$HOME/.cargo/bin"
+          CIBW_TEST_REQUIRES: pytest pytest-param-files
+          CIBW_TEST_SOURCES: tests
+          # bench_html.py/bench_tree.py need the benchmarking extra
+          # (pytest-benchmark, markdown-it-py), not relevant to a wheel test.
+          CIBW_TEST_COMMAND: >-
+            python -c "import markdown_it_pyrs.markdown_it_pyrs as m; assert m.__file__.endswith('.so'), m.__file__" &&
+            python -m pytest -v tests/test_api.py tests/test_cli.py tests/test_fixtures.py
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: markdown-it-pyrs-${{ env.MARKDOWN_IT_PYRS_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish markdown-it-pyrs ${{ inputs.version || '0.4.0' }}
+    needs: [setup, build_wheels]
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    with:
+      artifact-pattern: markdown-it-pyrs-${{ inputs.version || '0.4.0' }}-*-manylinux_riscv64