add int datacenter to firewall

fwrules/templates/chains.nft.j2

@@ -93,6 +93,10 @@ chain usc2_privnet {
     ip saddr 10.200.0.0/24 accept
 }
 
+chain int_privnet {
+    ip saddr 10.100.0.0/23 accept
+}
+
 chain vault_private {
     define ports_tcp = {
         8200,  # vault

fwrules/templates/firewall.nft.j2

@@ -37,6 +37,8 @@ table inet firewall {
         jump http_public
         {%- if datacenter == "usc2" %}
         jump usc2_privnet
+        {%- elif datacenter == "int" %}
+        jump int_privnet
         {%- endif %}
         {%- if nodetype == "builder" %}
         jump concourse_worker