Bug 1572739 - duplicate linux talos tasks for both 1604 and 1804. r=sparky

duplicate linux talos tasks for both 1604 and 1804.

Differential Revision: https://phabricator.services.mozilla.com/D105053

taskcluster/ci/config.yml

@@ -557,6 +557,11 @@ workers:
             implementation: generic-worker
             os: linux
             worker-type: 'gecko-{alias}'
+        t-linux-talos-1804:
+            provisioner: releng-hardware
+            implementation: generic-worker
+            os: linux
+            worker-type: 'gecko-{alias}'
         t-osx-1014:
             provisioner: releng-hardware
             implementation: generic-worker

taskcluster/taskgraph/transforms/tests.py

@@ -1796,6 +1796,16 @@ def set_worker_type(config, tasks):
                 "build-platform"
             ].startswith("linux64-ccov"):
                 task["worker-type"] = "t-linux-talos"
+                # TODO: duplicate tasks for linux-1804 (remove March 1st)
+                task1804 = copy.deepcopy(task)
+                task1804["test-platform"] = test_platform.replace(
+                    "linux64", "linux1804-64"
+                )
+                task1804["treeherder-machine-platform"] = task1804[
+                    "treeherder-machine-platform"
+                ].replace("linux64", "linux1804-64")
+                task1804["worker-type"] = "t-linux-talos-1804"
+                yield task1804
             else:
                 task["worker-type"] = LINUX_WORKER_TYPES[task["instance-size"]]
         else: