temp test for vpi on macos

Signed-off-by: Matthew Ballance <matt.ballance@gmail.com>

.github/workflows/tmp-osx-vpi-test.yml

@@ -0,0 +1,66 @@
+---
+# THROWAWAY WORKFLOW — delete before merging PR #7727.
+# Purpose: prove the runtime VPI dynamic-loading tests (t_flag_main_vpi*) actually
+# RUN and PASS on macOS/Darwin (Apple Silicon), which upstream CI only builds, never
+# tests. Mirrors the real osx build (ci/ci-install.bash + ci/ci-script.bash) and then
+# runs just the VPI tests via the driver.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+name: tmp-osx-vpi-test
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - vpi-main-fb-2
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  osx-vpi-test:
+    name: macOS VPI dynamic-load test
+    runs-on: macos-15
+    env:
+      CI_OS_NAME: osx
+      CI_RUNS_ON: macos-15
+      CI_DEV_ASAN: 0
+      CI_DEV_GCOV: 0
+      CXX: clang++
+      INSTALL_DIR: ${{ github.workspace }}/install
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Install build deps (osx)
+        env:
+          CI_BUILD_STAGE_NAME: build
+        run: ./ci/ci-install.bash
+
+      - name: Build Verilator (osx)
+        env:
+          CI_BUILD_STAGE_NAME: build
+        run: ./ci/ci-script.bash
+
+      - name: Create python venv
+        run: make venv
+
+      - name: Run VPI dynamic-load tests
+        run: |
+          source .venv/bin/activate
+          export VERILATOR_ROOT="$PWD"
+          uname -a
+          clang++ --version
+          cd test_regress
+          # --vlt selects the scenario these tests declare; pass the VPI tests explicitly
+          # so we don't run the whole (intentionally-not-run-on-macOS) suite.
+          ./driver.py --vlt \
+            t/t_flag_main_vpi.py \
+            t/t_flag_main_vpi_badentry.py \
+            t/t_flag_main_vpi_badlib.py \
+            t/t_flag_main_vpi_bootstrap.py \
+            t/t_flag_main_vpi_multi.py \
+            t/t_flag_main_vpi_noarray.py \
+            t/t_flag_main_vpi_noexe.py \
+            t/t_flag_main_vpi_nowarn.py