Allow using several git repos

[ochurlaud]

Fixes #47

[mhoffrog]

Hello @ochurlaud, @woolfg - regarding support for multiple repos, this pull request is partially overlapping with my pending pull request #56. But this request is implementing a nice and more generic approach by auto determining existing repos for the file path of the current artifact being saved. So I will take care of reviewing both pull requests to create a merge covering the features of both pull requests to provide backward compatibility as well as minimal additional configuration for a new plugin version.

[ochurlaud]

@woolfg I would need answer to the previous questions to move forward. I don't want to radically change the paradigm of this plugin without your opinion, but I think that if we follow the multi-repo idea, we need to make a design choice. Either the user knows all the repos, and we should do a namespace-oriented design (for instance with the git repos at the root of the first level namespace) or something completely agnostic, and in this case, remove a the pull features and only deal with pushes.

Both will work for me, but I think the latter is simpler to develop and I kind of lean towards this one (as I would rather have cron jobs to pull regularly, or add services to pull on webhooks : it scales well better with complex infrastructure like I tend to have with CI and so on).

[mhoffrog]

@ochurlaud please have a look at my reply (#65 (comment)). I fully agree with your thoughts and cases, but regarding the pull configuration, we have to consider backward compatibility of existing installations - and there are a few out so far.
The explicit configurations repoPath abd repoWorkDir will become obsolete by this merge now. So we could mark the configurations as deprecated and point this out in the documentation as well as in the configuration items description for a while.
@woolfg FYI

[ochurlaud]

Close, switch to https://github.com/woolfg/dokuwiki-plugin-gitbacked/tree/issues/47_multiple_repos