Add a structured output format for actions

[ahpook]

Currently the ospo-actions each make human readable reports, but it'd be beneficial to enable structured output like JSON which could get POSTed to a url. Users who are using an external system for logging or auditing could then parse the result and make use of the data for alerts, visualizations, etc.

[jmeridth]

@ahpook I like this.

I agree, by default an output variable of json. If a repo can offer other formats, make them available as an output (e.g., github.com/github/stale-repos saves markdown, that could be offered as an output also).

wdyt?

[lelia]

@ahpook I like this.

I agree, by default an output variable of json. If a repo can offer other formats, make them available as an output (e.g., github.com/github/stale-repos saves markdown, that could be offered as an output also).

wdyt?

JSON would be great as a default output — and markdown, when available, makes sense, too!