read version and git sha from classpath resources

don't run mvn package again as part of the deploy, also run mvn in batchmode
actually helps to include the files, too
deploy snapshots to sonatype on successful build
Remove duplicated attribute on alert conditions

The 'grace' attribute is already initialized in the parent.
Add a REST call to edit alert conditions
Add JBoss Maven repository to parent POM

Some artifacts (e. g. org.jboss.dashboard-builder:dashboard-builder-bom:pom:6.1.0.CR1)
don't seem to exist in Maven Central which made the build fail.