added logic to guard against builds running with wrong version + fixed ordering in changelog - #19

rutviksaptarshi:~/src/throwaway$ dpkg -I ovn-common_25.09.4-pf9-2026.9.0-486+u22_amd64.deb 
 new Debian package, version 2.0.
 size 2277266 bytes: control archive=1865 bytes.
     684 bytes,    17 lines      control
    1993 bytes,    30 lines      md5sums
     493 bytes,    25 lines   *  postinst             #!/bin/sh
     399 bytes,    24 lines   *  postrm               #!/bin/sh
      26 bytes,     1 lines      shlibs
      72 bytes,     2 lines      triggers
 Package: ovn-common
 Source: ovn
 Version: 1:25.09.4-pf9-2026.9.0-486+u22
 Architecture: amd64
 Maintainer: OVN developers <dev@openvswitch.org>
 Installed-Size: 8437
 Depends: libc6 (>= 2.34), libcap-ng0 (>= 0.7.9), libssl3 (>= 3.0.0~~alpha1), libunbound8 (>= 1.8.0), libunwind8
 Section: net
 Priority: extra
 Homepage: http://www.ovn.org/
 Description: OVN common components
  OVN, the Open Virtual Network, is a system to support virtual network
  abstraction.  OVN complements the existing capabilities of OVS to add
  native support for virtual network abstractions, such as virtual L2 and L3
  overlays and security groups.
  .
  ovn-common provides components required by other OVN packages.
rutviksaptarshi:~/src/throwaway$ dpkg -I ovn-common_25.09.4-pf9-2026.9.0-486+u24_amd64.deb 
 new Debian package, version 2.0.
 size 2237034 bytes: control archive=1864 bytes.
     679 bytes,    17 lines      control
    1993 bytes,    30 lines      md5sums
     493 bytes,    25 lines   *  postinst             #!/bin/sh
     399 bytes,    24 lines   *  postrm               #!/bin/sh
      26 bytes,     1 lines      shlibs
      75 bytes,     2 lines      triggers
 Package: ovn-common
 Source: ovn
 Version: 1:25.09.4-pf9-2026.9.0-486+u24
 Architecture: amd64
 Maintainer: OVN developers <dev@openvswitch.org>
 Installed-Size: 8329
 Depends: libc6 (>= 2.38), libcap-ng0 (>= 0.7.9), libssl3t64 (>= 3.0.0), libunbound8 (>= 1.8.0), libunwind8
 Section: net
 Priority: extra
 Homepage: http://www.ovn.org/
 Description: OVN common components
  OVN, the Open Virtual Network, is a system to support virtual network
  abstraction.  OVN complements the existing capabilities of OVS to add
  native support for virtual network abstractions, such as virtual L2 and L3
  overlays and security groups.
  .
  ovn-common provides components required by other OVN packages.
rutviksaptarshi:~/src/throwaway$ dpkg -I ovn-host_25.09.4-pf9-2026.9.0-486+u24_amd64.deb 
 new Debian package, version 2.0.
 size 665080 bytes: control archive=1890 bytes.
     767 bytes,    18 lines      control
     351 bytes,     5 lines      md5sums
    1790 bytes,    62 lines   *  postinst             #!/bin/sh
    1344 bytes,    52 lines   *  postrm               #!/bin/sh
     240 bytes,     7 lines   *  preinst              #!/bin/sh
     234 bytes,     7 lines   *  prerm                #!/bin/sh
 Package: ovn-host
 Source: ovn
 Version: 1:25.09.4-pf9-2026.9.0-486+u24
 Architecture: amd64
 Maintainer: OVN developers <dev@openvswitch.org>
 Installed-Size: 1883
 Depends: ovn-common (= 1:25.09.4-pf9-2026.9.0-486+u24), libc6 (>= 2.38), libcap-ng0 (>= 0.7.9), libssl3t64 (>= 3.0.0), libunbound8 (>= 1.8.0), libunwind8
 Section: net
 Priority: extra
 Homepage: http://www.ovn.org/
 Description: OVN host components
  OVN, the Open Virtual Network, is a system to support virtual network
  abstraction.  OVN complements the existing capabilities of OVS to add
  native support for virtual network abstractions, such as virtual L2 and L3
  overlays and security groups.
  .
  ovn-host provides the userspace components and utilities for
  OVN that can be run on every host/hypervisor.
rutviksaptarshi:~/src/throwaway$ dpkg -I ovn-host_25.09.4-pf9-2026.9.0-486+u22_amd64.deb 
 new Debian package, version 2.0.
 size 697246 bytes: control archive=1831 bytes.
     772 bytes,    18 lines      control
     347 bytes,     5 lines      md5sums
    1787 bytes,    62 lines   *  postinst             #!/bin/sh
    1223 bytes,    49 lines   *  postrm               #!/bin/sh
     231 bytes,     7 lines   *  prerm                #!/bin/sh
 Package: ovn-host
 Source: ovn
 Version: 1:25.09.4-pf9-2026.9.0-486+u22
 Architecture: amd64
 Maintainer: OVN developers <dev@openvswitch.org>
 Installed-Size: 1954
 Depends: ovn-common (= 1:25.09.4-pf9-2026.9.0-486+u22), libc6 (>= 2.34), libcap-ng0 (>= 0.7.9), libssl3 (>= 3.0.0~~alpha1), libunbound8 (>= 1.8.0), libunwind8
 Section: net
 Priority: extra
 Homepage: http://www.ovn.org/
 Description: OVN host components
  OVN, the Open Virtual Network, is a system to support virtual network
  abstraction.  OVN complements the existing capabilities of OVS to add
  native support for virtual network abstractions, such as virtual L2 and L3
  overlays and security groups.
  .
  ovn-host provides the userspace components and utilities for
  OVN that can be run on every host/hypervisor.
rutviksaptarshi:~/src/throwaway$