chore(deps): update docker.io/library/python docker tag to v3.15

Reviewed-on: #62

.gitea/workflows/tag.yaml

@@ -95,3 +95,22 @@ jobs:
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           pull: true
+
+  trigger-renovate:
+    # The deployment repo perso_private/tf-depl-kubernetes pins this image; its
+    # Renovate instance only scans hourly, so this dispatch opens the image bump
+    # PR within minutes of the release instead of up to an hour later.
+    needs: [build-push]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger Renovate on perso_private/tf-depl-kubernetes
+        # needs: build-push — Renovate reads Docker Hub, so a scan started before
+        # the push lands would only see the previous release.
+        # RENOVATE_TOKEN is the org-level secret of this organisation.
+        run: |
+          curl -sS -f -X POST \
+            -u "renovate:${{ secrets.RENOVATE_TOKEN }}" \
+            -H "Content-Type: application/json" \
+            -d '{{"ref":"main"}}' \
+            "https://scm.cabillot.eu/api/v1/repos/perso_private/tf-depl-kubernetes/actions/workflows/renovate.yaml/dispatches"
+          echo "Renovate dispatched on perso_private/tf-depl-kubernetes"

pkg/Dockerfile

@@ -1,5 +1,5 @@
 # 3.13, because with 3.14 it requires gcc (wheels not available)
-FROM docker.io/library/python:3.14-slim
+FROM docker.io/library/python:3.15-slim
 
 # Set environment variables
 ENV PYTHONDONTWRITEBYTECODE=1