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[WIP] Verify Ruby github/markup gem for markdown rendering

| ruby | markdown | github |

I’ve cloned github/markup and tried to built my own Docker image:

docker build -t halyph/markup .

But there was some error

Step 22/26 : COPY Gemfile.lock .
COPY failed: stat /var/lib/docker/tmp/docker-builder774079505/Gemfile.lock: no such file or directory

The easiest solution for solving this problem is commenting the next line # COPY Gemfile.lock . And run docker build again. Also, do not forget to push the newly created image to Docker Hub:

docker push halyph/markup

Now, I can try to run github/markup on some local/test files.

Lol, I noticed that this Docker file does not support my needs :-/ I need to fix it a bit.

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