fix: Compatibility with custom images

[W1ldPo1nter]

Description

Fixes the issue mentioned below. As suggested in that thread, I moved the generation of the expand link into the Python code, so that it gets passed to the template via context (which also moves logic from the template to the view layer, which should be a good thing).

While implementing the fix and testing via tox, I found that:

• the recent changes to the filer_check command were not compatible with a custom image model either
• while the tox tests have a flag to test with or without a swapped image model, the CI tests running via GitHub actions do not, meaning that there aren't any automated tests with a swapped image model right now

Therefore, I took the liberty to fix the mentioned command and extended the test action matrix with a flag for the image model swap (similar to the tox setup), so that problems with a custom image model have a chance to be caught automatically.

Related resources

• 1450

Checklist

• [x] I have opened this pull request against master
• [x] I have added or modified the tests when changing logic
• [ ] I have followed the conventional commits guidelines to add meaningful information into the changelog
• [ ] I have read the contribution guidelines and I have joined #workgroup-pr-review on Slack to find a “pr review buddy” who is going to review my pull request.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 76.90%. Comparing base (b0f39ab) to head (acd03e8).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1454 +/- ## ========================================== + Coverage 76.59% 76.90% +0.31% ========================================== Files 75 75 Lines 3546 3551 +5 Branches 568 570 +2 ========================================== + Hits 2716 2731 +15 + Misses 667 660 -7 + Partials 163 160 -3 ```

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