Implement github workflow events (Dispatch, Job, Run)

[dvonthenen]

This PR implements event processing for GitHub workflow_dispatch:
https://docs.github.com/en/developers/webhooks-and-events/webhooks/webhook-events-and-payloads#workflow_dispatch

workflow_job:
https://docs.github.com/en/developers/webhooks-and-events/webhooks/webhook-events-and-payloads#workflow_job

and workflow_run:
https://docs.github.com/en/developers/webhooks-and-events/webhooks/webhook-events-and-payloads#workflow_run

This implementation has been verified in a production environment (https://github.com/vmware-tanzu/community-edition) and details on its use can be found in this PR: vmware-tanzu/community-edition#2300

[coveralls]

Coverage increased (+0.2%) to 88.136% when pulling ffc40ad on dvonthenen:feature/workflowjob into 3c38273 on go-playground:master.

[dvonthenen]

Ok, this is hopefully ready for review now that I added in the go test and sample data.

[tohjustin]

Thanks for creating this PR! Would also like to see support for GitHub workflow events in this package.

[dvonthenen]

Thanks for creating this PR! Would also like to see support for GitHub workflow events in this package.

Not sure what you mean... could you point me out to where these events are in the code base? I'm fairly new to the GitHub webhook stuff.

[tohjustin]

Thanks for creating this PR! Would also like to see support for GitHub workflow events in this package.

Not sure what you mean... could you point me out to where these events are in the code base? I'm fairly new to the GitHub webhook stuff.

Sorry, I meant to say that I would like to see your changes in this PR merged. (I believe you have already implemented all the workflow-based webhook events that GitHub supports) 😄

@deankarn @Toshik1978 By any chance either of you are free this week to review this? Thank you 🙏🏼

[dvonthenen]

Ahhhhh ok... I thought it was something I was missing or something.

[tohjustin]

Thanks @dvonthenen & @Toshik1978!