Updated to Java 17

Dockerfile

@@ -1,9 +1,9 @@
-FROM gradle:jdk14 AS build
+FROM gradle:jdk17-alpine AS build
 COPY --chown=gradle:gradle . /home/gradle/src
 WORKDIR /home/gradle/src
-RUN gradle build --no-daemon
+RUN gradle fatJar --no-daemon
 
-FROM openjdk:14.0-slim
+FROM openjdk:17-alpine
 
 EXPOSE 4567