traits: add build-traits.yml for riscv64 wheels

.github/workflows/build-traits.yml

@@ -0,0 +1,107 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# Based on the `build-wheels` job of
+# https://github.com/enthought/traits/blob/7.1.0/.github/workflows/release-to-pypi.yml
+name: Build traits wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'traits version to build (git tag, e.g. 7.1.0)'
+        required: true
+        default: '7.1.0'
+  pull_request:
+    paths:
+      - '.github/workflows/build-traits.yml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '7.1.0' }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  TRAITS_VERSION: ${{ inputs.version || '7.1.0' }}
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+  MUSLLINUX_RISCV64_IMAGE: quay.io/pypa/musllinux_1_2_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+
+  build_wheels:
+    needs: [setup]
+    name: Build traits ${{ inputs.version || '7.1.0' }} ${{ matrix.python }}-${{ matrix.libc }}_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        python: ["cp312", "cp313", "cp314", "cp314t"]
+        libc: [manylinux, musllinux]
+
+    steps:
+      - name: Checkout traits ${{ env.TRAITS_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: enthought/traits
+          ref: ${{ env.TRAITS_VERSION }}
+          persist-credentials: false
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d  # v10.0.1
+        with:
+          python-version: '3.12'
+          activate-environment: true
+          enable-cache: false
+
+      # TEMPORARY: run cibuildwheel via CLI (instead of the pypa/cibuildwheel action)
+      # and tee its output to a file, because this run's per-job logs came back
+      # BlobNotFound from the Actions API (gotcha 62) - revert to the action once a
+      # real failure log is in hand.
+      - name: Build and test wheel
+        env:
+          CIBW_ARCHS: riscv64
+          CIBW_BUILD: ${{ matrix.python }}-${{ matrix.libc }}_riscv64
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          CIBW_MUSLLINUX_RISCV64_IMAGE: ${{ env.MUSLLINUX_RISCV64_IMAGE }}
+          # traits/tests is a real subpackage shipped in the wheel (setup.py's
+          # find_packages(include=["traits", "traits.*"]) picks it up), so the
+          # installed wheel already carries its own test suite - no staging needed.
+          # Mirrors upstream's own "Core tests" job (no test extras installed),
+          # which exists precisely to catch accidental optional-dependency use;
+          # traits/testing/optional_dependencies.py skipIf's the rest.
+          CIBW_TEST_COMMAND: >-
+            python -c "import traits.ctraits as m; assert m.__file__.endswith('.so'), m.__file__" &&
+            python -m unittest discover -v traits
+        run: |
+          set -o pipefail
+          uv pip install --upgrade cibuildwheel
+          python -m cibuildwheel --output-dir wheelhouse . 2>&1 | tee cibuildwheel.log
+
+      - name: Upload build log
+        if: always()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: traits-${{ env.TRAITS_VERSION }}-${{ matrix.python }}-${{ matrix.libc }}_riscv64-log
+          path: cibuildwheel.log
+          if-no-files-found: warn
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: traits-${{ env.TRAITS_VERSION }}-${{ matrix.python }}-${{ matrix.libc }}_riscv64
+          path: ./wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish traits ${{ inputs.version || '7.1.0' }}
+    needs: [setup, build_wheels]
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    with:
+      artifact-pattern: traits-${{ inputs.version || '7.1.0' }}-*riscv64