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Running a build with empty build args builds and pushes an image with no name

See original GitHub issue

Description

I recently ran this action in a workflow, with my repo name nicely lowercased (docker/build-push-action#37), but had one of my build args configured incorrectly. Note the environment variable BUILD_env=test, which should have been BUILD_ENV=test. My Dockerfile has default build args set (like ARG BUILD_ENV=development), but the build arg here was probably overwriting that. My bad.

However, the action actually sets the image name to [], kicks off a Docker build, completes the build, and attempts to push an image named [].

Specific image name below replaced with org/repo/image.

Run docker/build-push-action@v1
  with:
    username: br3ndonland
    password: ***
    build_args: BUILD_ENV=
    registry: docker.pkg.github.com
    repository: org/repo/image
    tag_with_ref: false
    tag_with_sha: false
    path: .
    always_pull: false
    add_git_labels: false
    push: true
  env:
    DOCKER_REPO: org/repo
    BUILD_env: test

...

Logging in to registry docker.pkg.github.com

Login Succeeded
Building image []
Sending build context to Docker daemon  301.6kB

...

Removing intermediate container c6704dceaa3b
---> 2a565e64a9ba
Successfully built 2a565e64a9ba
Pushing image []

Suggestions

The action should correctly read image names.
If the action doesn’t receive a name, it should stop and throw an error, rather than going through the entire build and push process.

docker/build-push-action#37 docker/build-push-action#41