Polish "Automate Docker update in CI"

See gh-20530

ci/scripts/create-pull-request.sh

@@ -1,11 +1,17 @@
 #!/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}/${GITHUB_REPO}/pulls" > /dev/null || { echo "Failed to create pull request" >&2; exit 1; }
+commit_message=$( cat commit-details/message )
+
+if [[ ${commit_message} != "" ]]; then
+	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; }
+else
+	echo "Already up-to-date"
+fi