Establish runtime-diagnostics pipeline

eng/pipelines/runtime-diagnostics.yml

@@ -0,0 +1,34 @@
+trigger: none
+
+schedules:
+  - cron: "0 10 * * *" # run at 10:00 (UTC) which is 2:00 (PST).
+    displayName: Runtime Diagnostics scheduled run
+    branches:
+      include:
+      - main
+    always: true
+
+resources:
+  repositories:
+    - repository: diagnostics
+      type: github
+      name: dotnet/diagnostics
+      endpoint: public
+
+variables:
+  - template: /eng/pipelines/common/variables.yml
+
+schedules:
+- cron: "30 2 * * *"
+  displayName: Every night at 2:30AM
+  branches:
+    include:
+    - main
+  always: true
+
+extends:
+  template:  /eng/pipelines/common/templates/pipeline-with-resources.yml
+  parameters:
+    stages:
+    - stage: Build
+      jobs: