Merge remote-tracking branch 'docker'

.dockerignore

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+target
+HELP.md

Dockerfile

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+FROM eclipse-temurin:20-jdk-jammy
+WORKDIR /app
+COPY .mvn/ .mvn
+COPY mvnw pom.xml ./
+RUN ./mvnw dependency:resolve
+COPY src ./src
+CMD ["./mvnw", "spring-boot:run"]