The current way API end points, i.e. sockets for API providers,
are provided to the sandbox is via a temporary directory that
is created by `BuildRoot` which later gets bind-mounted to a well
known path, i.e. /run/osbuild/api inside the sandbox. API providers
are expected to create their socket in that temporary directory.
Now that `BuildRoot` has a `regsiter_api` method and each API has
an `endpoint` property, the socket of each API provider, no matter
where it is located, will get bind-mounted individually inside
the sandbox at /run/osbuild/api using the `endpoint` identifier.
For backwards compatibility reasons the temporary api directory
will still be created by `BuildRoot`, but it is no longer bind
mounted inside the container. This paves the way to remove that
directory completely once all API providers are converted to not
use that directory anymore.
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