Add isc-dhcp-server to github workload

Install isc-dhcp-server package in order to run IPv6 PD system-tests.

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Acked-by: Mark Michelson <mmichels@redhat.com>
Signed-off-by: Numan Siddique <numans@ovn.org>

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
       dependencies: |
         automake libtool gcc bc libjemalloc2 libjemalloc-dev    \
         libssl-dev llvm-dev libelf-dev libnuma-dev libpcap-dev  \
-        selinux-policy-dev ncat python3-scapy
+        selinux-policy-dev ncat python3-scapy isc-dhcp-server
       m32_dependecies: gcc-multilib
       CC:          ${{ matrix.compiler }}
       LIBS:        ${{ matrix.libs }}