I have a requirement to run some post build steps before the artifact archiver so
I've recompiled the source code of this plugin https://wiki.jenkins-ci.org/display/JENKINS/Post+build+task to have
@Extension(ordinal = 100)

ie.
@Extension(ordinal = 100)
public static final class DescriptorImpl extends BuildStepDescriptor<Publisher> {
public DescriptorImpl()

{ super(PostbuildTask.class); load(); }

Though that seems to take effect on the dashboard (postbuild task section shows up on top of ArtifctAchiver section, in reality, the execution steps don't change.

ArtifactArchiver is still running before PostBuildTask plugin. Here's the console log

channel stopped
Archiving artifacts
Performing Post build task...
Match found for :. : True
Logical operation result is TRUE
Running script : jenkins-post-build.sh