svm/ci: validate tiers

Author: zapster

substratevm/ci/ci.jsonnet

@@ -145,6 +145,6 @@
   },
   // END MAIN BUILD DEFINITION
   processed_builds::run_spec.process(task_dict),
-  builds: util.add_defined_in([util.add_gate_predicate(b, gate_triggering_suites) for b in self.processed_builds.list], std.thisFile),
+  builds: util.add_defined_in([util.add_gate_predicate(sg.validate_tiers(b), gate_triggering_suites) for b in self.processed_builds.list], std.thisFile),
   assert tools.check_names($.builds),
 }

substratevm/ci/ci_common/svm-gate.libsonnet

@@ -152,4 +152,9 @@
       JAVA_HOME_RISCV    : {name : "labsjdk", version : b.downloads.JAVA_HOME.version + "-linux-riscv64" }
     },
   })),
+
+  validate_tiers(b)::
+    assert b.target != "gate": "Must not add new `gate` jobs.\nPlease change the target of the job '%s' to `tier1`, `tier2`, `tier3` or make it a post-merge or periodic job" % [b.name] ;
+    b
+ ,
 }