black: add build-black.yml for riscv64 wheels

.github/workflows/build-black.yml

@@ -0,0 +1,86 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on the `mypyc` job in:
+# https://github.com/psf/black/blob/26.5.1/.github/workflows/pypi_upload.yml
+#
+# black publishes mypyc-compiled wheels for common platforms but not riscv64. Its
+# committed [tool.cibuildwheel] config drives the whole build (hatch-mypyc hook
+# gated on HATCH_BUILD_HOOKS_ENABLE=1, CC=clang, the pytest suite), so we check out
+# the tag and inherit it, overriding only the riscv64 image. Setting CIBW_ENVIRONMENT
+# here would *replace* that table and silently drop the mypyc trigger — so we don't.
+name: Build black wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'black version to build (git tag, e.g. 26.5.1)'
+        required: true
+        default: '26.5.1'
+  pull_request:
+    paths:
+      - '.github/workflows/build-black.yml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '26.5.1' }}-${{ 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 there.
+  BLACK_VERSION: ${{ inputs.version || '26.5.1' }}
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  build_wheels:
+    name: Build black ${{ inputs.version || '26.5.1' }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 120
+    strategy:
+      fail-fast: false
+      matrix:
+        # mypyc emits per-interpreter (non-abi3) wheels; upstream skips free-threaded
+        # ("mypyc doesn't have great support for free threaded builds"), so no cp314t.
+        python: ["cp312", "cp313", "cp314"]
+
+    steps:
+      - name: Checkout black ${{ env.BLACK_VERSION }}
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0  # v7.0.0
+        with:
+          repository: psf/black
+          ref: ${{ env.BLACK_VERSION }}
+          persist-credentials: false
+
+      - name: Build wheels
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          only: ${{ matrix.python }}-manylinux_riscv64
+        env:
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: black-${{ env.BLACK_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish black ${{ inputs.version || '26.5.1' }} to GitLab
+    needs: [build_wheels]
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+
+    steps:
+      - name: Publish wheels and open docs PR
+        uses: riseproject-dev/python-wheels/actions/publish-wheels@main
+        with:
+          artifact-pattern: black-${{ env.BLACK_VERSION }}-*-manylinux_riscv64
+          gitlab-username: ${{ vars.GITLAB_DEPLOY_USER }}
+          gitlab-token: ${{ secrets.GITLAB_DEPLOY_TOKEN }}
+          gitlab-project-id: ${{ vars.GITLAB_PROJECT_ID }}
+          gh-token: ${{ secrets.GITHUB_TOKEN }}