Update quic_bridge_deployment.sh for IPv4 and .deb package (#6138)

Updated ping commands to explicitly use IPv4 and adjusted file permission checks with sudo. Changed the forward address prompt to specify IPv4 and modified the binary download process to fetch and install the latest .deb release URL automatically.

scripts/nym-node-setup/quic_bridge_deployment.sh

@@ -155,7 +155,7 @@ check_ip_routing() {
 
 perform_pings() {
     echo "Performing IPv4 ping to google.com..."
-    ping -c 4 google.com
+    ping -4 -c 4 google.com
     echo "---------------------------------------"
     echo "Performing IPv6 ping to google.com..."
     ping6 -c 4 google.com
@@ -189,7 +189,7 @@ test_bridge_connectivity() {
         echo -e "Testing IPv4 connectivity..."
         echo 
 
-        if ping -c 1 -I "$ipv4_address" google.com >/dev/null 2>&1; then
+        if ping -4 -c 1 -I "$ipv4_address" google.com >/dev/null 2>&1; then
             echo -e "${green}IPv4 connectivity is working. Fetching test data...${reset}"
             joke=$(curl -s -H "Accept: application/json" --interface "$ipv4_address" https://icanhazdadjoke.com/ | jq -r .joke)
             [[ -n "$joke" && "$joke" != "null" ]] && echo -e "${green}IPv4 test joke: $joke${reset}" || echo -e "${red}Failed to fetch test data via IPv4.${reset}"
@@ -277,7 +277,7 @@ check_bridge_installation() {
     # Check keys directory
     if [[ -d "$BRIDGE_KEYS_DIR" ]]; then
         echo -e "${green}✓ Keys directory exists: $BRIDGE_KEYS_DIR${reset}"
-        key_count=$(ls -1 "$BRIDGE_KEYS_DIR"/*.pem 2>/dev/null | wc -l)
+        key_count=$(sudo bash -c "ls -1 \"$BRIDGE_KEYS_DIR\"/*.pem" 2>/dev/null | wc -l)
         echo "  Keys found: $key_count"
     else
         echo -e "${red}✗ Keys directory not found: $BRIDGE_KEYS_DIR${reset}"
@@ -494,7 +494,7 @@ generate_bridge_keys() {
     # Generate ED25519 private key
     local key_file="$BRIDGE_KEYS_DIR/ed25519_bridge_identity.pem"
     
-    if [[ -f "$key_file" ]]; then
+    if sudo test -f "$key_file"; then
         echo -e "${yellow}Warning: Key file already exists at $key_file${reset}"
         read -p "Overwrite existing key? (yes/no): " confirm
         if [[ "$confirm" != "yes" ]]; then
@@ -532,14 +532,14 @@ create_client_params() {
 
     # Check if key exists
     local key_file="$BRIDGE_KEYS_DIR/ed25519_bridge_identity.pem"
-    if [[ ! -f "$key_file" ]]; then
+    if ! sudo test -f "$key_file"; then
         echo -e "${red}Error: Bridge key not found at $key_file${reset}"
         echo "Run 'nym-bridge-helper generate_bridge_keys' first"
         return 1
     fi
 
     # Get forward address
-    read -p "Enter forward address (e.g., <IPv4>:51822, can be found by running 'curl -6 https://ifconfig.co/ip'): " forward_addr
+    read -p "Enter forward address (e.g., <IPv4>:51822, can be found by running 'curl -4 https://ifconfig.co/ip'): " forward_addr
     if [[ -z "$forward_addr" ]]; then
         echo -e "${red}Error: Forward address is required${reset}"
         return 1
@@ -722,24 +722,28 @@ install_bridge_binary() {
     local red="\033[0;31m"
     local yellow="\033[0;33m"
 
+    local deb_arch="amd64"
+    local sys_arch=$(dpkg --print-architecture)
+
+    if [[ "$deb_arch" != "$sys_arch" ]]; then
+	echo -e "${red}Error: aborting .deb package installation as this system's arch is not amd64.${reset}"
+	echo "  Refer to https://github.com/nymtech/nym-bridges for build instructions."
+        exit 1
+    fi
+
     echo -e "${yellow}=== Installing nym-bridge Binary ===${reset}"
     echo ""
 
-    read -p "Enter bridge binary URL for your system from here https://builds.ci.nymte.ch/QUIC/: " binary_url
-    if [[ -z "$binary_url" ]]; then
-        echo -e "${red}Error: Binary URL is required${reset}"
-        return 1
-    fi
+    echo "Retrieving URL to latest release..."
+    local binary_url=$(
+        curl -s "https://api.github.com/repos/nymtech/nym-bridges/releases/latest" |
+	grep "browser_download_url.*amd64.deb" |
+        grep -o 'https://[^"]*'
+    )
 
-    echo "Downloading nym-bridge binary..."
-    if sudo curl -L "$binary_url" -o "$BRIDGE_BINARY"; then
-        sudo chmod 755 "$BRIDGE_BINARY"
-        echo -e "${green}✓ Bridge binary installed at $BRIDGE_BINARY${reset}"
-        
-        # Show version
-        echo ""
-        echo "Binary version:"
-        $BRIDGE_BINARY --version || echo "Unable to determine version"
+    echo "Downloading $binary_url ..."
+    if curl -L -o "/tmp/$(basename "$binary_url")" "$binary_url"; then
+	    sudo dpkg -i "/tmp/$(basename "$binary_url")"
     else
         echo -e "${red}✗ Failed to download bridge binary${reset}"
         return 1