Reschedule ci as a service milestone

_roadmap/software/2021-06-01-tasks.md → _roadmap/software/2021-09-01-tasks.md

 ---
-date: 2021-06-01
-title: Tasks in June 2021
+date: 2021-09-01
+title: Tasks in September 2021
 service: software
 ---
 
@@ -15,3 +15,7 @@ In order to bundle resources and enable research software projects
 to easily use CI for their projects, CI will be offered as a service.
 In this milestone, we will set up CI as a Service and test it first with few
 pilot centers, in order to make it available to all Helmholtz communities.
+
+Please note: The milestone was originally set for the end of the second quarter.
+Due to the underlying compute resources not being available in time this
+milestone needed to be rescheduled to the third quarter of 2021.