pikepdf: add build-pikepdf.yml for riscv64 wheels

.github/workflows/build-pikepdf.yml

@@ -0,0 +1,88 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on upstream's own wheel build:
+#   https://github.com/pikepdf/pikepdf/blob/v10.12.0/.github/workflows/build.yml (wheels_linux)
+name: Build pikepdf wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'pikepdf version/tag to build'
+        required: true
+        default: '10.12.0'
+  pull_request:
+    paths:
+      - '.github/workflows/build-pikepdf.yml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '10.12.0' }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  PIKEPDF_VERSION: ${{ inputs.version || '10.12.0' }}
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+
+  build_wheels:
+    needs: [setup]
+    name: Build pikepdf ${{ inputs.version || '10.12.0' }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    # before-all downloads and compiles qpdf (CMake) before the pikepdf extension itself.
+    timeout-minutes: 360
+    strategy:
+      fail-fast: false
+      matrix:
+        python: ["cp312", "cp313", "cp314", "cp314t"]
+
+    steps:
+      - name: Checkout pikepdf ${{ env.PIKEPDF_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: pikepdf/pikepdf
+          ref: v${{ env.PIKEPDF_VERSION }}
+          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: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          # CIBW_ENVIRONMENT replaces, not merges, upstream's [tool.cibuildwheel.environment]
+          # table, so QPDF_* (consumed by before-all's build-scripts/*.bash) must be repeated
+          # alongside our registry (CLAUDE.md gotcha 107).
+          CIBW_ENVIRONMENT: >-
+            QPDF_MIN_VERSION=12.3.2
+            QPDF_VERSION=12.3.2
+            QPDF_PATTERN=https://github.com/qpdf/qpdf/releases/download/vVERSION/qpdf-VERSION.tar.gz
+            PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
+          # hypothesis switched its build backend to maturin; newer releases have no
+          # riscv64 wheel anywhere, and maturin's rustup auto-install does not support
+          # riscv64 as a host triple. Our registry ships a wheel, so stay on it (gotcha 12:
+          # only-binary belongs in CIBW_TEST_ENVIRONMENT, not CIBW_ENVIRONMENT).
+          CIBW_TEST_ENVIRONMENT: PIP_ONLY_BINARY=hypothesis
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: pikepdf-${{ env.PIKEPDF_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish pikepdf ${{ inputs.version || '10.12.0' }}
+    needs: [setup, build_wheels]
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    with:
+      artifact-pattern: pikepdf-${{ inputs.version || '10.12.0' }}-*-manylinux_riscv64