`apify push` on old project structure fails

[barjin]

Running apify-cli push on a project with root actor.json file results in an error:

The file is still renamed, and the Actor is made on Platform, but the build never runs.

Subsequent apify-cli push call fails with a build error, since the Actor is already on the Platform. Using --force solves this issue.

Encountered on npx apify-cli push with 0.21.1.