loudness: Add version 0.2.0 (#3171)

Build the scikit-build-core/pybind11 extension for manylinux_riscv64
from the upstream 0.2.0 tag with cibuildwheel, mirroring upstream's
CI.yml, and run upstream's pytest suite against each wheel.

musllinux is not built: the registry has no musllinux numpy, which is
both a build and a test requirement. The licences of the compiled-in
gcem and thread-pool headers and of libebur128 are shipped in the wheel.

Author: luhenry

.github/workflows/build-loudness.yml

@@ -0,0 +1,102 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on: https://github.com/iver56/loudness/blob/0.2.0/.github/workflows/CI.yml
+name: Build loudness wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version glob to (re)build; empty builds every version of docs/packages/loudness.yaml not released yet'
+        required: false
+        default: ''
+  pull_request:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-loudness.yml'
+      - 'docs/packages/loudness.yaml'
+  push:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-loudness.yml'
+      - 'docs/packages/loudness.yaml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+    with:
+      package: loudness
+      version: ${{ inputs.version }}
+
+  build_wheels:
+    needs: [setup]
+    if: needs.setup.outputs.versions != '[]'
+    name: Build loudness ${{ matrix.version }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+        python: ["cp312", "cp313", "cp314", "cp314t"]
+
+    env:
+      LOUDNESS_VERSION: ${{ matrix.version }}
+
+    steps:
+      - name: Checkout loudness ${{ env.LOUDNESS_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: iver56/loudness
+          ref: ${{ env.LOUDNESS_VERSION }}
+          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: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          # Ship the licences of the compiled-in gcem/thread-pool headers and the libebur128 code libloudness derives from.
+          CIBW_ENVIRONMENT: >-
+            PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
+            PIP_ONLY_BINARY=numpy
+            SKBUILD_WHEEL_LICENSE_FILES="LICENSE;vendor/gcem/LICENSE;vendor/gcem/NOTICE.txt;vendor/thread-pool/LICENSE.txt;doc/license/libebur128.txt"
+          CIBW_TEST_REQUIRES: numpy pytest soundfile
+          CIBW_TEST_COMMAND: pytest {project}/tests
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: loudness-${{ env.LOUDNESS_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish loudness ${{ matrix.version }}
+    needs: [setup, build_wheels]
+    if: needs.setup.outputs.versions != '[]'
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    secrets:
+      app-private-key: ${{ secrets.RISEPROJECT_APP_PRIVATE_KEY }}
+    with:
+      artifact-pattern: loudness-${{ matrix.version }}-*-manylinux_riscv64

docs/packages/loudness.yaml

@@ -0,0 +1,5 @@
+package-name: loudness
+source-code: https://github.com/iver56/loudness
+license: MIT
+versions:
+- version: 0.2.0