Set timeout for Clouseau tests on containerized builders

For some reason, the local cluster to run the integration tests
that may require Clouseau (Search) does not always start up
properly which makes the execution hang indefinitely when run in
a Docker container.  Work around the issue by setting a reasonable
time limit (5 minutes) for each of those and combined with the
Jenkins retry, it can help with recovering the build in such
unfortunate scenarios.

Author: pgj

build-aux/Jenkinsfile

@@ -412,8 +412,8 @@ def generateContainerStage(platform) {
                     retry(3) {sh 'make eunit'}
                     if (meta[platform].quickjs_test262) {retry(3) {sh 'make quickjs-test262'}}
                     retry(3) {sh 'make elixir'}
-                    retry(3) {sh "${setClouseauJavaHome}make elixir-search ERLANG_COOKIE=crumbles"}
-                    retry(3) {sh "${setClouseauJavaHome}make mango-test ERLANG_COOKIE=crumbles"}
+                    retry(3) {sh "${setClouseauJavaHome}timeout 5m make elixir-search ERLANG_COOKIE=crumbles"}
+                    retry(3) {sh "${setClouseauJavaHome}timeout 5m make mango-test ERLANG_COOKIE=crumbles"}
                     retry(3) {sh 'make weatherreport-test'}
                     retry(3) {sh 'make nouveau-test'}
                   }