Add integration test to validated WAF v5 with `readOnlyRootFilesystem: true`

[shaun-nx]

UACs:

• Add new python test to run WAF v5 test in readOnlyRootFilesystem mode

[github-actions]

Hi @shaun-nx thanks for reporting!

Be sure to check out the docs and the Contributing Guidelines while you wait for a human to take a look at this 🙂

Cheers!