lilcom: add build-lilcom.yml for riscv64 wheels (#1229)

* **Package**: `lilcom`
* **Version**: `1.8.2`
* **Source**: https://github.com/danpovey/lilcom
* **Docs**: https://github.com/danpovey/lilcom

pybind11/CMake C++ extension for lossless compression of numpy audio-feature data, used across the Kaldi/lhotse speech-processing ecosystem. Upstream publishes no riscv64 wheel.

Mirrors [upstream's `build-wheels.yaml`](https://github.com/danpovey/lilcom/blob/v1.8.2/.github/workflows/build-wheels.yaml).

**Differs from upstream**
- Dropped cp314t - vendored pybind11 2.12.0 predates free-threaded CPython support; upstream ships no cp314t wheel for lilcom anywhere.

**Matrix**: cp312, cp313, cp314 only (see above).

**Testing**
- same as upstream (`test/test_header.py`, `test/test_lilcom.py`, `test/test_speed.py`)

**License**: OK

Built locally on macOS (`pip wheel`, no isolation issues); all three upstream test scripts passed against the resulting wheel.

Author: luhenry

.github/workflows/build-lilcom.yml

@@ -0,0 +1,82 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# Based on upstream's wheel builder:
+#   https://github.com/danpovey/lilcom/blob/master/.github/workflows/build-wheels.yaml
+name: Build lilcom wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'lilcom version to build (git tag without leading v, e.g. 1.8.2)'
+        required: true
+        default: '1.8.2'
+  pull_request:
+    paths:
+      - '.github/workflows/build-lilcom.yml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '1.8.2' }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  LILCOM_VERSION: ${{ inputs.version || '1.8.2' }}
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+
+  build_wheels:
+    needs: [setup]
+    name: Build lilcom ${{ inputs.version || '1.8.2' }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 60
+
+    strategy:
+      fail-fast: false
+      matrix:
+        # CMakeLists.txt FetchContent-pulls pybind11 v2.12.0, which predates
+        # free-threaded CPython support (added in pybind11 2.13); upstream itself
+        # ships no cp314t wheel for lilcom on any platform.
+        python: ["cp312", "cp313", "cp314"]
+
+    steps:
+      - name: Checkout lilcom v${{ env.LILCOM_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: danpovey/lilcom
+          ref: v${{ env.LILCOM_VERSION }}
+          persist-credentials: false
+
+      - uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          only: ${{ matrix.python }}-manylinux_riscv64
+        env:
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          CIBW_ENVIRONMENT: PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
+          CIBW_TEST_COMMAND: >-
+            python3 -c "import lilcom_extension; assert lilcom_extension.__file__.endswith('.so'), lilcom_extension.__file__" &&
+            python3 {package}/test/test_header.py &&
+            python3 {package}/test/test_lilcom.py &&
+            python3 {package}/test/test_speed.py
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: lilcom-${{ env.LILCOM_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: ./wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish lilcom ${{ inputs.version || '1.8.2' }}
+    needs: [setup, build_wheels]
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    with:
+      artifact-pattern: lilcom-${{ inputs.version || '1.8.2' }}-*-manylinux_riscv64