Improve LXC network wait and gateway check logic

Refactors the LXC container network initialization to simplify IP wait logic, reduce gateway ping attempts from 20 to 10, and provide clearer status messages. Now warns instead of failing if the gateway is unreachable but the container has an IP, improving robustness in network checks.

misc/build.func

@@ -2377,12 +2377,10 @@ EOF
   if [ "$var_os" != "alpine" ]; then
     msg_info "Waiting for network in LXC container"
 
-    # --- Step 1: Wait until the CT has an IP ---
+    # --- Step 1: Wait for IP ---
     for i in {1..20}; do
       ip_in_lxc=$(pct exec "$CTID" -- ip -4 addr show dev eth0 | awk '/inet / {print $2}' | cut -d/ -f1)
-      if [ -n "$ip_in_lxc" ]; then
-        break
-      fi
+      [ -n "$ip_in_lxc" ] && break
       sleep 1
     done
 
@@ -2391,20 +2389,23 @@ EOF
       exit 1
     fi
 
-    # --- Step 2: Wait until gateway responds ---
-    for i in {1..20}; do
+    # --- Step 2: Try to reach gateway ---
+    gw_ok=0
+    for i in {1..10}; do
       if pct exec "$CTID" -- ping -c1 -W1 "$GATEWAY" >/dev/null 2>&1; then
+        gw_ok=1
         break
       fi
       sleep 1
     done
 
-    if [ "$i" -eq 20 ]; then
-      msg_error "Gateway $GATEWAY unreachable from CT $CTID (IP $ip_in_lxc)"
-      exit 1
+    if [ "$gw_ok" -eq 1 ]; then
+      msg_ok "CT $CTID gateway $GATEWAY reachable (IP $ip_in_lxc)"
+    else
+      msg_warn "CT $CTID has IP $ip_in_lxc but gateway $GATEWAY did not reply"
     fi
 
-    # --- Step 3: DNS check ---
+    # --- Step 3: DNS / Internet check ---
     if pct exec "$CTID" -- getent hosts deb.debian.org >/dev/null 2>&1; then
       msg_ok "Network in LXC is reachable (DNS OK, IP $ip_in_lxc)"
     else