Document example workflows with upload and also test them

[sverhoeven]

Refs #79

Description

• Shows how to get the HTML files out of a workflow.
• Make the workflows shown in README the same as those in .github/workflows/usage.yml.
• The .github/workflows/usage.yml workflow no longer runs on each PR as .github/workflows/testing.yml tests the action much better. It can still be triggered manually see https://github.com/tortellini-tools/action/actions/runs/927859407 and will be run when main branch is changed.

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[jspaaks]

Thanks for the PR. I left a couple of comments. Apart from those, should we consider offering the two usage cases as separate workflow files? something like usage-current-repository.yml and usage-multiple-repositories.yml? (we can leave that for another day, just wanted to get your opinion)

[sverhoeven]

Thanks for the PR. I left a couple of comments. Apart from those, should we consider offering the two usage cases as separate workflow files? something like usage-current-repository.yml and usage-multiple-repositories.yml? (we can leave that for another day, just wanted to get your opinion)

Thanks for the comments, I addressed all of them.
I like you proposal. We are showing complete workflows in the README having them separated in .github/workflows make sense. It will make it easier to keep them the same (README vs .github/workflows).

[jspaaks]

Good stuff, thank you Stefan!