Github Actions: Push docker image build by gradle task - docker

Question

For building images of my current project, I use the gradle task bootBuildImage. This task creates a OCI image using Cloud Native Buildpacks.
- name: Build image with Gradle
run: ./gradlew bootBuildImage
With the next step I'm trying to push this docker image to my private GitHub registry using build-push-action.
- name: Push image to Registry
uses: docker/build-push-action#v1
with:
username: ${{ secrets.DOCKER_USERNAME }}
password: ${{ secrets.DOCKER_PASSWORD }}
registry: docker.pkg.github.com
repository: sullrich84/wettkampfdb-backend
tags: latest
env:
DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
As I can tell from the logs, the problem with this step is that it seems to rely on a Dockerfile located in the workspaces root directory which does not exist.
unable to prepare context: unable to evaluate symlinks in Dockerfile path:
lstat /github/workspace/Dockerfile: no such file or directory
Is it possible to push the image created via bootBuildImage to my private GitHub registry without using/creating a dedicated Dockerfile?

Answer 1

If you are just looking for something to deal with docker push, you can just use the native docker command to do it.
Something like this.
- name: run docker push
run: |
#docker login -u $DOCKER_USERNAME -p $DOCKER_PASSWORD
#docker push $BUILD_TAG
#docker push $LATEST_TAG
env:
DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}

Answer 2

The github-action you are using is not for pushing an image you define by repository and tag but rahter build and push https://github.com/docker/build-push-action#build-push-action
Builds and pushes Docker images and will log in to a Docker registry if required.
Specifically this is also related to https://github.com/docker/build-push-action/issues/17 - so just building without pushing is possible, not vice versa.
This github action does yet not allow just pushing.
This is for now very common for a lot of CI/CD solutions, where build and push are one task.

Answer 3

I use publishRegistry option of gradle bootBuildImage.
Set parameter in your build.gradle (below is gradle.kts)
tasks.bootBuildImage {
imageName = "${imageName}:${project.version}"
isPublish = true
docker {
publishRegistry {
url = dockerUrl
username = dockerUsername
password = dockerPassword
}
}
}
check this document