feat(cw): add a script to replace docker cubicweb images by the new cubicweb-base image

scripts/use-logilab-cubicweb-base-image.sh

+#!/bin/env bash
+
+set -x
+
+sed 's@FROM logilab/cubicweb.*@FROM logilab/cubicweb-base:latest@g' -i Dockerfile || true
+
+# GITLAB_TOKEN=$(cat token) cube-doctor run-script \
+#   -s scripts/use-logilab-cubicweb-base-image.sh \
+#   -b use-cw-base-image \
+#   -t clients \
+#   -c "chore: use cubicweb-base image"