Add sources.

Dockerfile

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+# Image to build the application
+FROM ubuntu:bionic
+
+RUN \
+  # Create builder user
+  groupadd builder && \
+  useradd builder -s /bin/bash -m -g builder -G sudo && \
+  echo 'builder:builder' |chpasswd && \
+  mkdir /home/builder/app && \
+  apt-get update && \
+  # Install utilities
+  apt-get install -y \
+    wget \
+    curl \
+    vim \
+    git \
+    zip \
+    bzip2 \
+    python \
+    build-essential \
+    software-properties-common \
+    sudo && \
+  # install OpenJDK 11
+  add-apt-repository ppa:openjdk-r/ppa && \
+  apt-get update && \
+  apt-get install -y openjdk-11-jdk && \
+  update-java-alternatives -s java-1.11.0-openjdk-amd64 && \
+  # Install Maven
+  apt-get install -y maven && \
+  # cleanup
+  apt-get clean && \
+  rm -rf \
+    /var/lib/apt/lists/* \
+    /tmp/* \
+    /var/tmp/*
+
+RUN \
+  # fix builder user permissions
+  chown -R builder:builder \
+    /home/builder && \
+  # cleanup
+  rm -rf \
+    /home/builder/.cache/ \
+    /var/lib/apt/lists/* \
+    /tmp/* \
+    /var/tmp/*
+
+USER builder
+
+WORKDIR "/home/builder/app"
+
+# Copy sources
+COPY . /home/builder/app/
+
+# Compile project
+RUN mvn package
+
+# Image to run the application
+FROM openjdk:11.0.11-jre-slim
+
+COPY --from=0 /home/builder/app/target/permutations.jar /app/permutations.jar
+
+ENTRYPOINT ["java", "-jar", "/app/permutations.jar"]