Add Dockerfile

Dockerfile

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+FROM openjdk:14-alpine as jdkbuilder
+RUN apk add --no-cache binutils
+ENV MODULES java.base,java.desktop,java.instrument,java.logging,java.management,java.naming,java.security.jgss,java.sql,java.xml
+RUN jlink --output /myjdk --module-path $JAVA_HOME/jmods --add-modules $MODULES --no-header-files --no-man-pages --strip-debug --compress=2
+RUN strip -p --strip-unneeded /myjdk/lib/server/libjvm.so
+
+FROM maven:3.6.3-jdk-14 as builder
+WORKDIR /app
+COPY pom.xml .
+RUN mvn verify clean --fail-never
+COPY src/main src/main
+RUN mvn package
+
+FROM alpine
+ENV APPLICATION_USER app
+RUN adduser -D -g '' $APPLICATION_USER
+RUN mkdir /app
+RUN chown -R $APPLICATION_USER /app
+USER $APPLICATION_USER
+COPY --from=builder /app/target/kotlin-starter*.jar /app/app.jar
+COPY --from=jdkbuilder /myjdk /myjdk
+COPY config.toml /app/config.toml
+WORKDIR /app
+EXPOSE 7000
+CMD ["/myjdk/bin/java", "-server", "-jar", "app.jar"]