E2E tests are flaky in CI

[jpraynaud]

Issue

From time to time the end to end tests are flaky in the CI, and this is apparently due to the snapshot archive unpacking in the client.

The error message received is:

Error: "An error occured: Could not unpack './snapshot-22f81f68e3d5491957f54e845cc0fa0c127fe3544cfdc5acaa6298380de7ae49' in directory './db'. Error: « failed to iterate over archive »."

Such as seen in theses runs of the CI:
https://github.com/input-output-hk/mithril/actions/runs/5510503974/jobs/10044909118#step:6:415
https://github.com/input-output-hk/mithril/actions/runs/5455167396/jobs/9926333652#step:6:415
https://github.com/input-output-hk/mithril/actions/runs/5412931936/jobs/9837872288#step:6:423
https://github.com/input-output-hk/mithril/actions/runs/5347095372/jobs/9714290612#step:6:417
https://github.com/input-output-hk/mithril/actions/runs/5376212741/jobs/9753448786#step:6:425
https://github.com/input-output-hk/mithril/actions/runs/5376881183/jobs/9754849879#step:6:416

When trying to unpack the produced archive afterwards, there is no problem.

To do

• Understand why the archive is not correctly unpacked
• Fix the problem or add a retry mechanism in the client