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; }

ci/scripts/detect-docker-updates.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+latest_version=$(curl -I -s https://github.com/docker/docker-ce/releases/latest | grep "location:" | awk '{n=split($0, parts, "/"); print substr(parts[n],2);}' | awk '{$1=$1;print}' | tr -d '\r' | tr -d '\n' )
+
+if [[ $latest_version =~ (beta|rc) ]]; then
+	echo "Skip pre-release versions"
+	exit 0;
+fi
+
+latest="https://download.docker.com/linux/static/stable/x86_64/docker-$latest_version.tgz"
+current=$( git-repo/ci/images/get-docker-url.sh )
+
+if [[ $current = $latest ]]; then
+	echo "Already up-to-date"
+	exit 0;
+fi
+
+existing_tasks=$( curl -s https://api.github.com/repos/${GITHUB_ORGANIZATION}/${GITHUB_REPO}/pulls\?labels\=type:%20task\&state\=open\&creator\=spring-buildmaster )
+existing_upgrade_issues=$( echo "$existing_tasks" | jq -c --arg TITLE "$ISSUE_TITLE" '.[] | select(.title==$TITLE)' )
+
+if [[ ${existing_upgrade_issues} = "" ]]; then
+	pushd git-repo > /dev/null
+	popd > /dev/null
+	git clone git-repo docker-updates-git-repo > /dev/null
+	pushd docker-updates-git-repo > /dev/null
+	# Create changes in dedicated branch
+	branch="ci-docker-$latest_version"
+	git config user.name "Spring Buildmaster" > /dev/null
+	git config user.email "buildmaster@springframework.org" > /dev/null
+	git checkout -b "$branch" origin/master > /dev/null
+	sed -i "s/version=.*/version=\"$latest_version\"/" ci/images/get-docker-url.sh
+	git add ci/images/get-docker-url.sh > /dev/null
+	commit_message="Upgrade to Docker $latest_version in CI"
+	git commit -m "$commit_message" > /dev/null
+else
+	echo "Pull request already exists."
+fi