GitHub Actions Cannot Find JAR file in Target Directory-CodePudding

I am trying to use GitHub Actions to build a Docker image and publish it to Docker Hub.

I'm getting an error during the Build and push step when it is attempting to build the Docker image because it cannot find the target directory.

The Docker build step is looking in /tmp/buildkit-mount147850474/target but my JAR is in /home/runner/work/myrepo/myrepo/target/app-0.0.1-SNAPSHOT.jar.

How do I tell the Docker build step to use the correct directory?

I looked at working-directory but the documentation says it is only for run steps.

Error

#6 [3/3] COPY target/*.jar app.jar
#6 ERROR: lstat /tmp/buildkit-mount147850474/target: no such file or directory

Log snippet when it saves the JAR

[INFO] Building jar: /home/runner/work/myrepo/myrepo/target/app-0.0.1-SNAPSHOT.jar

Dockerfile

FROM openjdk:17-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"]

publish.yml

name: Publish Docker Image

on:
  push:
    tags:
      - '*'

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: Set up JDK 17
        uses: actions/setup-java@v2
        with:
          java-version: '17'
          distribution: 'adopt'
          cache: maven
      - name: Build with Maven
        run: mvn -B package --file pom.xml
      - name: Set output
        id: vars
        run: echo ::set-output name=tag::${GITHUB_REF#refs/*/}
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
      - name: Login to DockerHub
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKER_HUB_USERNAME }}
          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
      - name: Build and push
        id: docker_build
        uses: docker/build-push-action@v2
        working-directory:  ${{ github.workspace }}
        with:
          push: true
          tags: ${{ github.repository }}:${{ steps.vars.outputs.tag }}

CodePudding user response：

I have a similar pipeline but when I use docker/build-push-action:

I have no working-directory param
I have a context param set to current directory in with map

Could you try to modify your Build and push step like this ?

- name: Build and push
  id: docker_build
  uses: docker/build-push-action@v2
  with:
    context: .    
    push: true
    tags: ${{ github.repository }}:${{ steps.vars.outputs.tag }}

You can have a look at this example (https://morioh.com/p/2d04d286363b) and also at documentation of this action (https://github.com/docker/build-push-action)