Define project.build.outputTimestamp

[basil]

One issue blocking progress on jenkinsci/plugin-pom#919 is that we do not conform to https://maven.apache.org/guides/mini/guide-reproducible-builds.html by defining a project.build.outputTimestamp property.

[basil]

It should be simple enough to configure the archetype as recommended in https://maven.apache.org/guides/mini/guide-reproducible-builds.html#how-do-i-configure-my-maven-build for new plugins, but the real challenge associated with this task is to add the property to existing plugins that don't have automated release enabled (and where jenkinsci/incrementals-tools#104 would not apply).

[jglick]

So this issue is now limited to plugins using MRP? Then

if you use maven-release-plugin, you'll need version 3.0.0-M1 or later: it will automatically update the timestamp value in pom.xml during the release in the same commit that updates version,

implies that the archetype could just set this to some placeholder value (but then CD instructions ought to remind you to delete it).

At this point it would make more sense to preconfigure CD in the archetype, at least optionally.

[basil]

but then CD instructions ought to remind you to delete it

@jglick Have you read the CD instructions you link to above to see whether they already contain the thing you think they ought to contain?