Make the buildbot aware of the configuration templates
Tha buildbot a lacking the feature, which causes it to not run all the
builds on diff.
Submit a diff with a C++ change and check the builds are run as
Reviewers: #bitcoin_abc, jasonbcox
Reviewed By: #bitcoin_abc, jasonbcox
Differential Revision: https://reviews.bitcoinabc.org/D8520