Setup core for unified pipelines. (Azure#7577)

* Setup core for unified pipelines.

* Added open census to the core pipeline (can be released independently).

sdk/core/ci.yml

@@ -1,10 +1,24 @@
 # DO NOT EDIT THIS FILE
 # This file is generated automatically and any changes will be lost.
 
+resources:
+  repositories:
+    - repository: azure-sdk-tools
+      type: github
+      name: Azure/azure-sdk-tools
+      endpoint: azure
+    - repository: azure-sdk-build-tools
+      type: git
+      name: internal/azure-sdk-build-tools
+
 trigger:
   branches:
     include:
     - master
+    - feature/*
+    - hotfix/*
+    - release/*
+    - restapi*
   paths:
     include:
     - sdk/core/
@@ -21,14 +35,12 @@ pr:
     include:
     - sdk/core/
 
-resources:
-  repositories:
-    - repository: azure-sdk-tools
-      type: github
-      name: Azure/azure-sdk-tools
-      endpoint: azure
-
-jobs:
-- template: ../../eng/pipelines/templates/jobs/archetype-sdk-client.yml
+stages:
+- template: ../../eng/pipelines/templates/stages/archetype-sdk-client.yml
   parameters:
-    ServiceDirectory: core
+    ServiceDirectory: core
+    Artifacts:
+    - name: azure_core
+      safeName: azurecore
+    - name: azure_core_tracing_opencensus
+      safeName: azurecorecoretracingopencensus