Verify the copy on write semantics of `objectstore.Object`, i.e.
content will only be copied at the moment a client wants to write
to `Object`. This also checks that `Object.base` works.
Modify the CI to execute the unit tests in a privileged container
because `Object.read()` works internally by bind mounting a path.
The mount operation needs at least CAP_SYS_ADMIN and overwriting
the file permissions CAP_DAC_OVERRIDE.
A single workflow allows us to re-use artifacts throughout all jobs.
Also, we can fail the tests early if there's a linting issue before
we spend time waiting for RPMs to build.
Signed-off-by: Major Hayden <major@redhat.com>
