Add CONFIG_PACKAGE_kmod-tun for main-router config

To install tailscale/zerotier package, it is required to install
kmod-tun. That would not increase image size too much, but would help
to use that software.

Signed-off-by: Daniel Pawlik <pawlik.dan@gmail.com>

configs/common/main-router

@@ -142,3 +142,6 @@ CONFIG_PACKAGE_wifi-scripts=y
 CONFIG_ALL_KMODS=y
 CONFIG_ALL_NONSHARED=y
 CONFIG_AUTOREMOVE=y
+
+# For tailscail/zerotier
+CONFIG_PACKAGE_kmod-tun=y

openwrt-configure.sh

@@ -78,6 +78,7 @@ if [[ "$DEVICE" =~ Main|main ]]; then
     PACKAGES="$PACKAGES ddns-scripts luci-app-ddns"
     PACKAGES="$PACKAGES luci-proto-wireguard kmod-wireguard wireguard-tools qrencode"
     PACKAGES="$PACKAGES tc-full pciutils kmod-phy-aquantia"
+    PACKAGES="$PACKAGES kmod-tun"
     if [ -n "$SQM_TOOL" ]; then
         PACKAGES="$PACKAGES $SQM_TOOL"
     fi
@@ -135,6 +136,9 @@ esac
 ### wireguard
 #       luci-proto-wireguard kmod-wireguard wireguard-tools qrencode
 
+### Tailscale/Zerotier
+#       kmod-tun
+
 ### DNS over HTTPS
 #       unbound-daemon luci-app-unbound