Creating inline files with here-doc in Dockerfile doesn't work

[shollander]

Expected Behavior

The following Dockerfile should work (https://docs.docker.com/reference/dockerfile/#example-creating-inline-files):

FROM alpine
COPY <<EOF /etc/myconf
setting1=value
EOF

Current Behavior

Fails with the following error:

Could not build image: COPY failed: no source files were specified

The Dockerfile works fine with commandline docker build.

[bmuschko]

I'd have to see the task that you are running. Can you provide your build logic?

[shollander]

This is my Gradle task:

tasks.register("buildDockerImage", DockerBuildImage) {
    inputDir = project.projectDir
    images.add("me/myImage")
}