Automate Docker updates in CI

See gh-20530

ci/scripts/create-pull-request.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+set -e
+
+curl \
+  -s \
+	-u ${GITHUB_USERNAME}:${GITHUB_PASSWORD} \
+	-H "Content-type:application/json" \
+	-d "{\"head\":\"${BRANCH}\",\"base\":\"${BASE_BRANCH}\",\"title\":\"${ISSUE_TITLE}\",\"body\":\"\",\"labels\":[\"status: waiting-for-triage\",\"type: task\"]}"  \
+	-f \
+	-X \
+	POST "https://api.github.com/repos/${GITHUB_ORGANIZATION}/${GITHUB_REPO}/pulls" > /dev/null || { echo "Failed to create pull request" >&2; exit 1; }