Avoid auto-release when there are no "releasable" commits

The determination of "releasable" is in the release scripts, but
currently it boils down to having a Jira key in the commit message.

Author: yrodiere

ci/release/Jenkinsfile

@@ -115,13 +115,6 @@ pipeline {
 					def releaseVersion
 					def developmentVersion
 
-					def lastCommitter = sh(script: 'git show -s --format=\'%an\'', returnStdout: true).trim()
-					def secondLastCommitter = sh(script: 'git show -s --format=\'%an\' HEAD~1', returnStdout: true).trim()
-					def isCiLastCommiter = lastCommitter == 'Hibernate-CI' && secondLastCommitter == 'Hibernate-CI'
-
-					echo "Last two commits were performed by '${lastCommitter}'/'${secondLastCommitter}'."
-					echo "Is 'Hibernate-CI' the last commiter: '${isCiLastCommiter}'."
-
 					if ( manualRelease ) {
 						echo "Release was requested manually"
 
@@ -139,10 +132,13 @@ pipeline {
 					else {
 						echo "Release was triggered automatically"
 
-						// Avoid doing an automatic release for commits from a release
-
-						if (isCiLastCommiter) {
-							print "INFO: Automatic release skipped because last commits were for the previous release"
+						// Avoid doing an automatic release if there are no "releasable" commits since the last release (see release scripts for determination)
+						def releasableCommitCount = sh(
+								script: ".release/scripts/count-releasable-commits.sh ${env.PROJECT}",
+								returnStdout: true
+						).trim().toInteger()
+						if ( releasableCommitCount <= 0 ) {
+							print "INFO: Automatic release skipped because no releasable commits were pushed since the previous release"
 							currentBuild.getRawBuild().getExecutor().interrupt(Result.NOT_BUILT)
 							sleep(1)   // Interrupt is not blocking and does not take effect immediately.
 							return