Jenkinsfile: Yet another attempt at working around the pain.

Jenkinsfile

 node {
      checkout scm
      env.VERSION_STRING = "0.01-devel-${env.BUILD_ID}"
+     env.HOME = env.PWD
      GIT_TAG = sh(returnStdout: true, script: "git tag --sort version:refname | tail -1").trim()
      if(GIT_TAG) {
          env.VERSION_STRING = GIT_TAG