fixing docker build

Dockerfile

@@ -1,7 +1,23 @@
-FROM openjdk:8-jdk-alpine
-VOLUME /tmp
-ARG DEPENDENCY=target/dependency
-# COPY ${DEPENDENCY}/BOOT-INF/lib /app/lib
-COPY ${DEPENDENCY}/META-INF /app/META-INF
-# COPY ${DEPENDENCY}/BOOT-INF/classes /app
-ENTRYPOINT ["java","-cp","app","com.becausesec.chuckjokes.ChuckjokesApplicationKt"]
+# Use the official maven/Java 8 image to create a build artifact.
+# https://hub.docker.com/_/maven
+FROM maven:3.6.3-jdk-11-slim as builder
+
+# Copy local code to the container image.
+WORKDIR /app
+COPY pom.xml .
+COPY src ./src
+
+# Build a release artifact.
+RUN mvn package -DskipTests
+
+# Use AdoptOpenJDK for base image.
+# It's important to use OpenJDK 8u191 or above that has container support enabled.
+# https://hub.docker.com/r/adoptopenjdk/openjdk8
+# https://docs.docker.com/develop/develop-images/multistage-build/#use-multi-stage-builds
+FROM adoptopenjdk/jdk-11.0.6_10-alpine-slim
+
+# Copy the jar to the production image from the builder stage.
+COPY --from=builder /app/target/chuckjokes-*.jar /chuckjokes.jar
+
+# Run the web service on container startup.
+CMD ["java", "-Djava.security.egd=file:/dev/./urandom", "-jar", "/chuckjokes.jar"]