Expose rendered spec after merging via an API and the cli

[banjoh]

Describe the rationale for the suggested feature.

Troubleshoot has the ability to merge multiple specs and run all collectors/analysers/redactors in the resulting spec. These specs can be pulled from (as of today) the following sources

• http(s) urls
• oci uris
• files on disk (will include multidocs as well)
• embedded uris

Merged collectors are then deduplicated and some default specs (cluster-resources, cluster-info, default redactors) added as well. It has now become hard to get a full picture of how the full support bundle spec would look like before executing it.

Describe the feature

• Define a public API that would be used to build a full spec from merged specs
• Using this public API, add a new subcommand/cli option to render the entire spec. Some examples of how the CLI interface would look like are

  support-bundle render-spec <uris...> # same for preflight
  support-bundle <uris...> --dry-run # same for preflight

Tasks

• [x] Add flag to preflight binary
• [ ] Add flag to support-bundle binary

[chris-sanders]

I really like this idea. Removing confusion can pay off in multiple ways.