ci: add workflow to update regression baselines

Author: harryswift01

.github/workflows/update_regression_baselines.yaml

@@ -0,0 +1,44 @@
+name: Update Regression Baselines
+
+on:
+  workflow_dispatch:
+
+concurrency:
+  group: update-regression-baselines-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: write
+
+jobs:
+  update-baselines:
+    name: Update regression baselines
+    runs-on: ubuntu-24.04
+    timeout-minutes: 30
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
+        with:
+          ref: ${{ github.ref }}
+
+      - name: Set up Python
+        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        with:
+          python-version: "3.14"
+          cache: pip
+
+      - name: Install testing dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install -e .[testing]
+
+      - name: Update regression baselines
+        run: pytest tests/regression --update-baselines
+
+      - name: Commit updated baselines
+        uses: stefanzweifel/git-auto-commit-action@778341af668090896ca464160c2def5d1d1a3eb0 # v6
+        with:
+          commit_message: "test(regression): update baselines"
+          commit_user_name: github-actions[bot]
+          commit_user_email: 41898282+github-actions[bot]@users.noreply.github.com