fix: Allow if and input in group steps

[Tyler-2]

Fixes #54 and #57

I have no idea how to get this approved and merged because there is no contribution documentation.

In the meantime... you can save:
https://raw.githubusercontent.com/Tyler-2/pipeline-schema/fix-if-and-input/schema.json
to a local place and then open up your VSCode or VSCodium settings and navigate to Settings, Extensions, YAML, Yaml: Schemas, "Edit in settings.json".

And then add something like:

    "yaml.schemas": {
        
        "/home/someuser/unnecessarydownloads/schema.json": "pipeline.yml"

    },

Which will tell the yaml language server to use that schema.json for files named pipeline.yml.

[Techn1x]

@jonathanly @alexle @sj26
Apologies for the ping-spray, hoping one of you (being the most recent contributors) can help us out

[eleanorakh]

Thanks @Tyler-2, we'll take a look at this one shortly 👀

[angusfretwell]

Hi @Tyler-2, thanks for this! I've just added some examples to our tests for group steps and also included stringInputStep in the steps schema.