Update docker build process

Dockerfile

@@ -1,22 +1,27 @@
-FROM openjdk:17-jdk-slim
+FROM eclipse-temurin:17-jdk-alpine as build
 
-RUN apt-get -y update
-RUN apt-get -y install netcat
-RUN apt-get -y install curl
+COPY .mvn/ .mvn
+COPY mvnw pom.xml ./
+COPY src ./src
+COPY bot.properties.example bot.properties ./
+
+RUN ["chmod", "+x", "./mvnw"]
+RUN ./mvnw install
+
+
+FROM eclipse-temurin:17-jre-alpine
+
+RUN apk add netcat-openbsd
+RUN apk add curl
 
 WORKDIR /app
 
 ARG API_PORT=9000
 EXPOSE ${API_PORT}
 
-COPY .mvn/ .mvn
-COPY mvnw pom.xml ./
-COPY src ./src
 COPY bot.properties.example bot.properties ./
 COPY startup.sh ./
-
-RUN ["chmod", "+x", "./mvnw"]
-RUN ./mvnw install
+COPY --from=build /target/netneutrality-jar-with-dependencies.jar ./
 
 RUN ["chmod", "+x", "./startup.sh"]
 CMD ["./startup.sh"]