Ship the libsubid4 and libsubid-dev packages and ship getsubids in uidmap

debian/control

@@ -64,3 +64,26 @@ Depends: ${shlibs:Depends},
 Description: programs to help use subuids
  These programs help unprivileged users to create uid and gid mappings in
  user namespaces.
+
+Package: libsubid4
+Section: libs
+Priority: optional
+Architecture: any
+Multi-Arch: same
+Pre-Depends: ${misc:Pre-Depends}
+Depends: ${shlibs:Depends}, ${misc:Depends}
+Description: subordinate id handling library -- shared library
+ The library provides an interface for querying, granding and ungranting
+ subordinate user and group ids.
+
+Package: libsubid-dev
+Section: libdevel
+Priority: optional
+Architecture: any
+Depends: ${misc:Depends}, libsubid4 (= ${binary:Version})
+Description: subordinate id handling library -- shared library
+ The library provides an interface for querying, granding and ungranting
+ subordinate user and group ids.
+ .
+ This package contains the C header files that are
+ needed for applications to use the libsubid4 library.