WIP: fail the build

Jenkinsfile

@@ -99,6 +99,9 @@ def submitTests(architecture, type, board, ostree = false) {
 
 def buildOStree(architecture, type, board, debosarguments = "", repo = "repo") {
 
+  // fail the build
+  sh(script: "false")
+
   // Allow to work with not-existing branches
   // ostree-push refuses to update ostree branch if `ostree pull` failed by any other reason
   sh(script: """\