Updated Dockerfile in order to make available mock_server to the cert-bins image (#38095)

Author: rquidute

integrations/docker/images/chip-cert-bins/Dockerfile

@@ -306,6 +306,9 @@ RUN pip install --break-system-packages -r /tmp/requirements.txt && rm /tmp/requ
 COPY --from=chip-build-cert-bins /root/connectedhomeip/src/python_testing/requirements.txt /tmp/requirements.txt
 RUN pip install --break-system-packages -r /tmp/requirements.txt && rm /tmp/requirements.txt
 
+# Stage 3.2: Setup the Mock Server
+COPY --from=chip-build-cert-bins /root/connectedhomeip/integrations/mock_server mock_server
+
 # PIP requires MASON package compilation, which seems to require a JDK
 RUN set -x && DEBIAN_FRONTEND=noninteractive apt-get update; apt-get install -fy openjdk-8-jdk