tests/integration/project: Use the same alias for the alpine tarball

This makes the integration tests use the same 'alpine' alias for the tests as we use in the examples, this avoids a redundant download of an extra alpine tarball in integration tests.

This is a part of #603 (closed)

enabled an automatic merge when the pipeline for fa476d79 succeeds

merged

mentioned in commit 255f9ee3

mentioned in issue #603 (closed)

mentioned in merge request !723 (merged)