Set up CI for JDK 12

Closes gh-16212

ci/scripts/detect-jdk-updates.sh

@@ -10,6 +10,10 @@ case "$JDK_VERSION" in
 		 BASE_URL="https://api.adoptopenjdk.net/v2/info/releases/openjdk11"
 		 ISSUE_TITLE="Upgrade Java 11 version in CI image"
 	;;
+	java12)
+		 BASE_URL="https://api.adoptopenjdk.net/v2/info/releases/openjdk12"
+		 ISSUE_TITLE="Upgrade Java 12 version in CI image"
+	;;
 	*)
 		echo $"Unknown java version"
 		exit 1;