simple github action

[moul]

should be a no-brainer, simple install: 1. adding a new generic and simple .yml file, 2. updating the main readme to point to the generated file(s).

should be scalable: 1 fetch, multiple images.

I created this new project -> https://github.com/moul/depviz-action; you can look at this repo which is similar in the principle -> https://github.com/moul/repoman-action.

Feel free to setup the new action on various repos, including:

• moul/depviz
• moul/depviz-test
• pathwar/pathwar

Wait a little bit more for the next ones.

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