Cannot build plugin

[mrginglymus]

Since the addition of the withChecks (#49), I've been unable to build locally, due to the error:

 Failed to resolve new artifacts: Could not find artifact io.jenkins.plugins:checks-api:hpi:1.2.0null in repo.jenkins-ci.org (https://repo.jenkins-ci.org/public/). The API analysis will not proceed.

Adding back the -SNAPSHOT to the pom doesn't help, as it then complains about breaking semantic versioning.

Out of interest, I tried bumping to 2.0.0 (with -SNAPSHOT), which succeeded, but with:

Failed to resolve old artifacts: Could not find artifact io.jenkins.plugins:checks-api:hpi:1.2.0${changelist} in repo.jenkins-ci.org (https://repo.jenkins-ci.org/public/). The API analysis will proceed comparing the new archives against an empty archive.

:(

[uhafner]

This is what I noted in my review: https://github.com/jenkinsci/checks-api-plugin/pull/49/files#r544681526

[uhafner]

Without a SNAPSHOT we cannot release as well.