Issue: Matrix construction does not match GitHub

[catthehacker]

Nothing which blocks this PR,
I think you aren't really aware of the behavior of the matrix include statement, (this is not introduced in this PR, but not fixed either)

Example Workflow run:
https://github.com/actions/runner/actions/runs/1082604590/workflow

This workflow demonstrates that includes needs to be handeled differently, if your matrix cross product is non empty and you have includes.

In my c# implementation of this,

• Create the cross product (this seems to work in act with this PR)
• apply excludes (this seems to work in act with this PR)
• Merge the cross product if all member which are both in the cross product and include mapping are equal (added members or matrix entries to the cross product via include are not considered), otherwise do it like this code does.

Well this might be not perfect either, but this seems for me to be more like github actions.

Originally posted by @ChristopherHX in #763 (comment)