add template update

Author: tmigot

.github/workflows/TemplateUpdate.yml

@@ -0,0 +1,72 @@
+name: Template Update
+
+on:
+  workflow_call:
+
+permissions:
+  contents: write       # needed to push branch / commits
+  pull-requests: write  # needed to open PRs
+
+jobs:
+  template-update:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      # Hack for setup-python cache (same as your existing Copier workflow)
+      - name: Hack for setup-python cache
+        run: touch requirements.txt
+
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          cache: pip
+          python-version: "3.11"
+
+      - name: Hack for setup-python cache (cleanup)
+        run: rm requirements.txt
+
+      - name: Install Copier and pre-commit
+        run: |
+          pip install copier pre-commit
+
+      - name: Check that answers file exists
+        run: |
+          if [ ! -f ".copier-answers.jso.yml" ]; then
+            echo "::error::.copier-answers.jso.yml not found. \
+This repo must first be generated from JSOTemplate (or have its answers file added) before it can be updated."
+            exit 1
+          fi
+
+      - name: Run Copier update from JSOTemplate
+        run: |
+          # You can add --trust if your template needs it:
+          # copier -a .copier-answers.jso.yml update --trust
+          copier -a .copier-answers.jso.yml update || true
+
+      - name: Run pre-commit (optional but handy)
+        run: |
+          pre-commit run -a || true
+
+      - name: Create Pull Request
+        id: cpr
+        uses: peter-evans/create-pull-request@v7
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          commit-message: "chore: :robot: template update from JSOTemplate"
+          title: "[AUTO] Template update from JSOTemplate"
+          body: |
+            Automated template update from JSOTemplate.
+
+            This PR was generated by the Template Update workflow using:
+            - answers file: .copier-answers.jso.yml
+          branch: auto-template-update
+          delete-branch: true
+          labels: chore, automated pr, no changelog
+
+      - name: Check outputs
+        run: |
+          echo "Pull Request Number - ${{ steps.cpr.outputs.pull-request-number }}"
+          echo "Pull Request URL - ${{ steps.cpr.outputs.pull-request-url }}"