Simple workflow job: You can add an exclusion behaviour, but it's ignored
Sounds like it could be a bug. But I wonder how you could even hope to have this work, since IIRC the exclusion option only works when using workspace-based polling, which is inefficient and not currently supported by Workflow (cf. JENKINS-26138).
Multibranch: There's no exclusion option.
Generally GitSCMSource seems to lack support for extensions. Would be an RFE in git-plugin.
Github organization: There's no exclusion option.
RFE for github-branch-source, dependent on the previous RFE. (There is no way to configure per-repository SCM settings I am afraid.)
Sounds like it could be a bug. But I wonder how you could even hope to have this work, since IIRC the exclusion option only works when using workspace-based polling, which is inefficient and not currently supported by Workflow (cf. JENKINS-26138).
Generally GitSCMSource seems to lack support for extensions. Would be an RFE in git-plugin.
RFE for github-branch-source, dependent on the previous RFE. (There is no way to configure per-repository SCM settings I am afraid.)