The previous command `rm -rf /cleanup` tried to remove the bind mount
point itself, which the kernel rejects with EBUSY. Changed to
`find /cleanup -mindepth 1 -maxdepth 1 -exec rm -rf {} +` which
removes all contents without touching the mount point. The existing
fsPromises.rmdir() call then cleans up the empty host directory.
* fix(stacks): resolve permission denied error when deleting stacks with root-owned files
When Docker Compose creates files as root inside a stack directory, the
non-root Sencho process cannot remove them. This adds a Docker-based
fallback: if fsPromises.rm fails with EACCES/EPERM, Sencho spawns a
short-lived Alpine container to clean up the root-owned files.
Also enhances docker compose down with --volumes --remove-orphans to let
Docker clean up its own resources before filesystem deletion.
* docs: clarify that pre-existing root-owned stacks can be deleted
* fix(stacks): include Docker stderr in fallback deletion error message
Fixes CI lint failure: 'stderr' was assigned but never read in
forceDeleteViaDocker(). Now surfaces Docker stderr output in the error
message when the fallback cleanup fails.
Anso