Merge branch 'renovatebot-schedule' into 'master'

feat: expand on renovastebot scheduling

See merge request !452

docs/explanations/renovatebot.md

@@ -10,7 +10,9 @@ depend on particular provider versions.
 Keeping on top of these dependencies is a challenge. In particular it is a challenge to keep on top
 of dependencies which prove a security risk due to known vulnerabilities. We employ container and
 dependency scanning in GitLab CI which helps with awareness of vulnerabilities but it is still
-something of a chore to freshen dependencies when necessary.
+something of a chore to freshen dependencies when necessary. The exact scan schedule may change
+as the service evolves but will always comprise multiple runs per week. If you require an exact
+schedule, [trigger renovatebot from a scheduled CI job](../howtos/trigger-renovatebot-from-ci.md).
 
 [Renovatebot](https://docs.renovatebot.com/) is a piece of software which regularly scans projects
 in GitLab and maintains Merge Requests (MRs) which freshen dependencies.