fix: improve abra install retry logic and remove restart loop

common.nix

@@ -519,10 +519,13 @@ isoConfig
       fi
 
       # Attempt installation with retry logic
-      for attempt in {1..300}; do
-        echo "🚀 Installing abra (attempt $attempt/300)..."
+      for attempt in {1..60}; do
+        echo "🚀 Installing abra (attempt $attempt/60)..."
 
-        if curl -fsSL https://install.abra.coopcloud.tech | bash; then
+        # Quick internet check before attempting installation
+        if ! curl -s --max-time 3 https://abra.coopcloud.tech >/dev/null 2>&1; then
+          echo "🌐 No internet connectivity, skipping attempt $attempt"
+        elif curl -fsSL https://install.abra.coopcloud.tech | bash; then
           # Verify installation success using CORRECT check method
           if sudo abra --version >/dev/null 2>&1; then
             echo "✅ abra installed successfully"
@@ -541,13 +544,13 @@ isoConfig
           echo "❌ Installation attempt $attempt failed"
         fi
 
-        if [ $attempt -lt 300 ]; then
-          echo "⏳ Retrying in 10 seconds..."
-          sleep 10
+        if [ $attempt -lt 60 ]; then
+          echo "⏳ Retrying in 5 seconds..."
+          sleep 5
         fi
       done
 
-      echo "❌ abra installation failed after 300 attempts"
+      echo "❌ abra installation failed after 60 attempts"
       exit 1
     '';
 
@@ -555,8 +558,6 @@ isoConfig
       Type = "oneshot";
       RemainAfterExit = true;
       User = "root";
-      Restart = "on-failure";
-      RestartSec = "30s";
       Environment = [
         "TERM=xterm-256color"
         "HOME=/root"