utils: add generic function for pointers

Go doesn't offer a generic method to convert a type in to its pointer.
This method is practical for the podman bindings where there are several
field which are pointer, and without this method, you would need to
define a variable and then pass its address. E.g for booleans:
   foo := utils.Ptr(true)
instead of
   t := true
   foo := &t

Signed-off-by: Alice Frosi <afrosi@redhat.com>

Author: alicefr

pkg/utils/pointer.go

@@ -0,0 +1,5 @@
+package utils
+
+func Ptr[T any](v T) *T {
+	return &v
+}