sign artifacts only when uploading release artifacts
load credentials for deployment repositories from .jenkins-ci.org
Merge pull request #12 from daspilker/local-development

Signing and Credentials
removed version in build.gradle since it conceals the version in gradle.properties
use -SNAPSHOT version for development phase
Merge pull request #10 from daspilker/version

Fixed version
fixed JENKINS-23603, do not exclude instance-identity
Merge pull request #9 from daspilker/JENKINS-23603

[JENKINS-23603] do not exclude instance-identity
use the same repository as org.jenkins-ci.main:pom