Add a CI job that tests staging with buildbox-fuse (`FuseStager`)
Context
buildbox-casd!108 (merged) enables casd to use buildbox-fuse if it is found in the system's $PATH
. However, on the CI that command is not present, so only the HardLinkStager
is tested.
Task Description
Make the integration_test
cover the FUSE staging mechanism as well.
Acceptance Criteria
The CI tests all staging mechanisms supported by casd.