Merge pull request #1010 from db-ui/chore-docs-e2e-problem-solving-section

chore(docs): e2e problem solving section

Author: mfranzke

e2e/README.md

@@ -16,3 +16,7 @@ This directory provides `docker-compose.yml` to test or regenerate screenshots.
 ## Test with linux build
 
 -   run `docker-compose -f ./e2e/docker-compose.start.yml up`
+
+## FAQ
+
+If you're running into errors on testing or screenshot generation e.g. regarding missing dependencies (`db-ui-mono-e2e-playwright-1 | sh: 1: cross-env: not found`), you're probably based on an old version of the image. That for you would need to rebuild the image by adding the '--build' parameter, like e.g. `docker-compose -f ./e2e/docker-compose.regenerate.yml up --build`