Add ADR for storing repo data as JSON blob

[richpjames]

No description provided.

[adamhughes86]

These both are sensible suggestions

[shuldt]

Looks good, sensible decisions well expressed

[shuldt]

Do we want to add a brief note as to why here

[danlivings-dxw]

It might be worth mentioning that we'll need to configure a container volume to enable data persistence across deployments, but otherwise this makes sense to me.

[richpjames]

@danlivings-dxw I was thinking initially we could keep the changes committed alongside the code in order for us to avoid containerisation

[danlivings-dxw]

@richpjames I'm not sure we'd want to commit what is essentially a file-based database to this repository, as that would leak information about private repositories and would introduce a manual step to making sure that Towtruck is displaying up-to-date information.

I'd imagine an okay way to do this would be a folder named something like .towtruck that lives inside the application folder. That way we can add it to .gitignore so we don't accidentally commit its contents, and if we do define a Dockerfile at some point it will be close enough that it won't need a separate volume.

[richpjames]

@danlivings-dxw yeah that's a good point. I wasn't aware of the number of private repositories dxw has. In #27 I've added it as a seed step that can be run on demand.