Support stdin for input

[garethr]

For those of us that love pipes, it would be useful to support stdin for reading the files.

some-command-that-returns-an-sbom | sbom-utility <command>

That way you could dynamically generate reports, or query an sboms content in one command, without writing anything to disk.

This would be explicit, eg. -i - is fairly common as a pay of specifying that it should read from stdin rather than a local file.

There's an interesting ecosystem of tools emerging around SBOMs that really play to this sort of pipelining. Happy to help with the implementation if this is of interest.

[mrutkows]

@garethr what an excellent idea! I will look into it as soon as I update the internal structs to support all the new v1.5 features. If you read my "hidden manifesto" in the README, then these kind of tool chains are exactly what I am hoping to accommodate.