Add Azure-hosted benchmarking workflows for Linux and Windows.

This patch leverages the new benchmarking features added in cri-tools
in [this PR](kubernetes-sigs/cri-tools#894) to
add GitHub workflows for automatically running the benchmarks on
Azure-based VMs for both Linux and Windows, as well as adding a Python
script which generates plot graphs for the results.

Signed-off-by: Nashwan Azhari <nazhari@cloudbasesolutions.com>

.github/workflows/linux-benchmarks-trigger.yml

@@ -0,0 +1,34 @@
+# Workflow intended to periodically run the Linux Benchmarks workflow.
+
+name: Linux Benchmarks Trigger
+
+on:
+  workflow_dispatch:
+  schedule:
+    # NOTE: benchmarks should run twice a month:
+    - cron: "0 0 1 * *"
+    - cron: "0 0 15 * *"
+
+jobs:
+
+  triggerWinIntegration:
+    if: github.repository == 'containerd/containerd'
+    # NOTE(aznashwan, 6/6/2022): GitHub actions do not currently support referencing
+    # or evaluating any kind of variables in the `uses` clause, but this will
+    # ideally be added in the future in which case the hardcoded reference to the
+    # upstream containerd repository should be replaced with the following to
+    # potentially allow contributors to enable periodic benchmarks on forks as well:
+    # uses: "${{ github.repository }}/.github/workflows/linux-benchmarks.yml@${{ github.ref_name }}"
+    uses: containerd/containerd/.github/workflows/linux-benchmarks.yml@main
+    with:
+      containersNumber: 500
+      containersNumberParallel: 1
+      imagesNumber: 500
+      imagesNumberParallel: 1
+      podsNumber: 500
+      podsNumberParallel: 1
+    secrets:
+      AZURE_SUB_ID: "${{ secrets.AZURE_SUB_ID }}"
+      AZURE_CREDS: "${{ secrets.AZURE_CREDS }}"
+      GCP_SERVICE_ACCOUNT: "${{ secrets.GCP_SERVICE_ACCOUNT }}"
+      GCP_WORKLOAD_IDENTITY_PROVIDER: "${{ secrets.GCP_WORKLOAD_IDENTITY_PROVIDER }}"