Port substratevm gates to tiers.

Author: zapster

substratevm/ci/ci.jsonnet

@@ -22,6 +22,9 @@
   local spotbugs = task_spec(common.deps.spotbugs),
   local jdt = task_spec(common.deps.jdt),
   local gate = sg.gate,
+  local tier1 = sg.tier1,
+  local tier2 = sg.tier2,
+  local tier3 = sg.tier3,
   local gdb(version) = task_spec(sg.gdb(version)),
   local use_musl_static = sg.use_musl_static,
   local use_musl_dynamic = sg.use_musl_dynamic,

substratevm/ci/ci_common/svm-gate.libsonnet

@@ -67,6 +67,9 @@
   }),
 
   gate:: $.target("gate"),
+  tier1:: $.target("tier1"),
+  tier2:: $.target("tier2"),
+  tier3:: $.target("tier3"),
   daily:: $.target("daily"),
   weekly:: $.target("weekly"),
   ondemand:: $.target("ondemand"),