podman mount: some better error wrapping

As shown in #23671 these functions can return the raw error without any
useful context to the user which makes it hard to understand where
things went wrong. Simply add some context to some error paths here.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

libpod/runtime_ctr.go

@@ -1412,13 +1412,13 @@ func (r *Runtime) IsStorageContainerMounted(id string) (bool, string, error) {
 
 	mountCnt, err := r.storageService.MountedContainerImage(id)
 	if err != nil {
-		return false, "", err
+		return false, "", fmt.Errorf("get mount count of container: %w", err)
 	}
 	mounted := mountCnt > 0
 	if mounted {
 		path, err = r.storageService.GetMountpoint(id)
 		if err != nil {
-			return false, "", err
+			return false, "", fmt.Errorf("get container mount point: %w", err)
 		}
 	}
 	return mounted, path, nil

pkg/domain/infra/abi/containers.go

@@ -1421,7 +1421,7 @@ func (ic *ContainerEngine) ContainerMount(ctx context.Context, nameOrIDs []strin
 			if errors.Is(err, types.ErrContainerUnknown) || errors.Is(err, types.ErrLayerUnknown) || errors.Is(err, define.ErrCtrExists) {
 				continue
 			}
-			return nil, err
+			return nil, fmt.Errorf("check if storage container is mounted: %w", err)
 		}
 
 		var name string
@@ -1449,7 +1449,7 @@ func (ic *ContainerEngine) ContainerMount(ctx context.Context, nameOrIDs []strin
 				errors.Is(err, define.ErrCtrRemoved) {
 				continue
 			}
-			return nil, err
+			return nil, fmt.Errorf("check if container is mounted: %w", err)
 		}
 
 		if mounted {