feat: pass workflow inputs

[jenhagg]

Purpose

We have workflows that can be run manually, via github's ui, which can have a user provided input. Main example is the docker image tag, where we can specify latest or stable. We also trigger these workflows from other ones, but don't have a way to override the default. Example: we want to publish the postreise:stable docker image when a new package is released to pypi, but have to run that manually because the default tag is latest. This PR fixes that by allowing a workflow to specify what a user would.

What the code is doing

Allow a workflow using this action to provide inputs to the target workflow (the one being triggered).

Testing

Tested in https://github.com/jenhagg/test-ci, both without the inputs and with a non default value.

Where to look

The commit history in the test-ci repo could be useful. Here are the docs about the REST API https://docs.github.com/en/rest/actions/workflows#create-a-workflow-dispatch-event

Time estimate

5 min, or more if you want to read the docs

[rouille]

This is nice

[BainanXia]

TIL!