DockerHub自动构建失败，但在本地成功

Question

在我的本地Docker构建成功，但是在链接到我的Github帐户的Docker集线器上自动构建失败。你能建议我哪里错了吗？

Dockerfile

FROM openjdk:8-jdk-alpine
RUN addgroup -S spring && adduser -S spring -G spring
USER spring:spring
ARG JAR_FILE=target/*.jar
COPY ${JAR_FILE} app.jar
ENTRYPOINT ["java","-jar","/app.jar"]

我在DockerHub上的构建配置

这是构建错误

Step 5/6 : COPY ${JAR_FILE} app.jar
COPY failed: no source files were specified

Answer 1

我们需要在此处进行多阶段构建。下面是我的DockerFile的引用

#
# Build stage
#
FROM maven:3.6.0-jdk-11-slim AS build
COPY src /home/app/src
COPY pom.xml /home/app
RUN mvn -f /home/app/pom.xml clean package

#
# Package stage
#
FROM openjdk:11-jre-slim
COPY --from=build /home/app/target/*.jar /usr/local/lib/app.jar
EXPOSE 8080
ENTRYPOINT ["java","-jar","/usr/local/lib/app.jar"]