Add Dockerfile

Dockerfile

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+FROM eclipse-temurin:20-jdk-alpine
+LABEL authors="laurentkap"
+
+VOLUME /tmp
+ARG EXTRACTED=target/extracted
+COPY ${EXTRACTED}/dependencies/ ./
+COPY ${EXTRACTED}/spring-boot-loader/ ./
+COPY ${EXTRACTED}/snapshot-dependencies/ ./
+COPY ${EXTRACTED}/application/ ./
+EXPOSE 8080
+RUN addgroup -S demo && adduser -S demo -G demo
+USER demo
+ENTRYPOINT ["java","org.springframework.boot.loader.JarLauncher"]