fix: Docs should only publish on pushes to main with docs path. (#321)

### Type of change

- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [x] Documentation update (improves or adds clarity to existing
documentation)

Author: pweglik

.github/workflows/publish_docs.yml

@@ -4,6 +4,9 @@ on:
   push:
     branches:
       - main
+    paths:
+      - '.github/workflows/publish_docs.yml'
+      - 'docs/**'
   workflow_dispatch:
 jobs:
   publish: