Add retry to smart_build of agent binaries

Requires https://review.lan.tribe29.com/c/checkmk_ci/+/134995

smart_build is doing the right thing and building as requested. The
problem of in proper handling of failed builds is not solved and not
part of this commit. This commit only fixes the early exit, thrown and
self-catched by smart_build preventing a retry in the outer smart_stage

Change-Id: I69f9d0dddb1d3428ea4618018fdc5b7ed94a5b9f

Author: JonasScharpf

buildscripts/scripts/utils/package_helper.groovy

@@ -142,6 +142,9 @@ def provide_agent_binaries(Map args) {
                     use_upstream_build: true,
                     relative_job_name: details.relative_job_name,
                     download: false,
+                    // set allow_retry true if retry is desired
+                    // smart_build would swallow the self-raised error and not cause a retry
+                    allow_retry: details.retry ? true : false,
                 ];
 
                 if (details.dependency_paths) {