ci(template): Trigger builds on Release Candidate tags (#472)

Author: NickLarsenNZ

template/.github/workflows/build.yml.j2

@@ -13,7 +13,8 @@ on:
       - trying
       - "renovate/**"
     tags:
-      - '[0-9][0-9].[0-9]+.[0-9]+(-rc[0-9]+)?'
+      - '[0-9][0-9].[0-9]+.[0-9]+'
+      - '[0-9][0-9].[0-9]+.[0-9]+-rc[0-9]+'
   pull_request:
   merge_group:
   schedule: