DRA: add canary jobs and sync mechanism

config/jobs/kubernetes/sig-node/.dra-sync-settings

@@ -0,0 +1,2 @@
+# Last commit which was synced into dynamic-resource-allocation.yaml.
+last_sync=056f34d0fffe6816d4f4ef7acd2e14811ff5c67a

config/jobs/kubernetes/sig-node/dra-sync.sh

@@ -0,0 +1,62 @@
+#!/usr/bin/env bash
+# Copyright 2024 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Running this script will automatically take changes made to
+# dynamic-resource-allocation-canary.yaml since the last sync
+# (tracked in .dra-sync-settings) and create a commit which
+# applies those changes to dynamic-resource-allocation.yaml.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../../../.." && pwd -P)"
+cd "${REPO_ROOT}"
+
+# get "last_sync"
+source "config/jobs/kubernetes/sig-node/.dra-sync-settings"
+
+if [ -n "$(git diff --cached 2>&1)" ]; then
+    echo >&2 "ERROR: The git staging area must be clean."
+    exit 1
+fi
+
+new_sync=$(git rev-parse HEAD)
+
+diff=$(git diff ${last_sync}..${new_sync} config/jobs/kubernetes/sig-node/dynamic-resource-allocation-canary.yaml | sed -e 's/-canary//g')
+
+if [ -z "${diff}" ]; then
+    echo "No changes since last sync, nothing to do."
+    exit 0
+fi
+
+# Generate a "git format-patch" alike patch and apply it.
+git am <<EOF
+From ${new_sync}
+From: dra-sync.sh helper script <[email protected]>
+Date: $(date --rfc-email)
+Subject: [PATCH 1/1] dra: apply changes from canary jobs
+
+---
+${diff}
+$(diff -u config/jobs/kubernetes/sig-node/.dra-sync-settings <(sed -e "s/last_sync=.*/last_sync=${new_sync}/" config/jobs/kubernetes/sig-node/.dra-sync-settings) | sed -e 's;^--- .*;--- a/config/jobs/kubernetes/sig-node/.dra-sync-settings;' -e 's;+++ .*;+++ b/config/jobs/kubernetes/sig-node/.dra-sync-settings;')
+EOF
+
+git log -p -n1
+
+cat <<EOF
+
+Commit created successfully (see above). Review and submit as a pull request.
+EOF