MT#60337 tap-test: update Docker environment to use j-d-g from internal-bookworm

We run the *-tap-test Jenkins jobs in a docker environment.  To be able
to use jenkins-debian-glue from our own internal repository, we need to
enable the repository in apt's sources.list configuration.

Change-Id: Id9cccd0f7edd15ebffc1fc71e274d6943c77a2c3

t/tap-tests-docker/Dockerfile

@@ -5,7 +5,11 @@ FROM docker.mgm.sipwise.com/sipwise-bookworm:latest
 # is updated with the current date. It will force refresh of all
 # of the base images and things like `apt-get update` won't be using
 # old cached versions when the Dockerfile is built.
-ENV REFRESHED_AT 2023-06-26
+ENV REFRESHED_AT 2024-06-19
+
+# we want to use jenkins-debian-glue from our own internal
+# repository and not from Debian
+RUN echo 'deb https://deb.sipwise.com/autobuild internal-bookworm main'  > /etc/apt/sources.list.d/internal.list
 
 RUN apt-get update && apt-get install --assume-yes --no-install-recommends \
   binutils \