Create main.yml

[bradvoth]

No description provided.

[github-learning-lab]

The Dockerfile isn't where I expected. Here are some troubleshooting steps that might help.

Problem	Solution
The file isn't called Dockerfile (case sensitive).	Rename the file using the UI or your CLI.
The directory action-a doesn't exist.	Create the action-a folder and move the Dockerfile to action-a.
The Dockerfile isn't inside the action-a folder.	Move the Dockerfile to action-a.

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When I detect your new commit, I'll respond in this pull request.