Skip lint on merge / minor other repo updates

[kostrykin]

Skips lint on merge & ignores lint errors when deploying (inspired by 4a08630 from https://github.com/galaxyproject/tools-iuc/pull/5429).

xref #71

FOR CONTRIBUTOR:

• [x] - I have read the CONTRIBUTING.md document and this tool is appropriate for the galaxy-image-analysis repo.
• [x] - License permits unrestricted use (educational + commercial)
• [ ] - This PR adds a new tool or tool collection
• [ ] - This PR updates an existing tool or tool collection
• [x] - This PR does something else (explain below)

[kostrykin]

Thanks, there seems to be still an issue with the new pr.yaml, trying to figure it out https://github.com/BMCV/galaxy-image-analysis/actions/runs/6809353120