Add regression test action; add test data

[kad-korpem]

Description

Add new GitHub action to execute regression tests for known/previous issues. Add test data to support the regression tests.

Type of change

(Remove irrelevant options)

• New feature
• Configuration change

Checklist:

• I've double-checked the code in this PR myself
• I've left the code better than before (boy scout rule)
• The code is readable, comments are added that explain hard or non-obvious parts.
• I've expanded/improved the (unit) tests, when applicable
• I've run (unit) tests that prove my solution works
• There's no sensitive information like credentials in my PR

[rkettelerij]

Wel goede test dit!