Add button to add public instance to custom list

Shared/Settings/AddPublicInstanceButton.swift

@@ -0,0 +1,29 @@
+import SwiftUI
+
+struct AddPublicInstanceButton: View {
+    @ObservedObject private var accounts = AccountsModel.shared
+
+    @State private var id = UUID().uuidString
+
+    var body: some View {
+        if let account = accounts.current, let app = account.app, account.isPublic, !account.isPublicAddedToCustom {
+            Button {
+                _ = InstancesModel.shared.add(app: app, name: "", url: account.urlString)
+                regenerateID()
+            } label: {
+                Label("Add \(account.urlString)", systemImage: "plus")
+            }
+            .id(id)
+        }
+    }
+
+    private func regenerateID() {
+        id = UUID().uuidString
+    }
+}
+
+struct AddPublicInstanceButton_Previews: PreviewProvider {
+    static var previews: some View {
+        AddPublicInstanceButton()
+    }
+}

Shared/Settings/LocationsSettings.swift

@@ -93,6 +93,7 @@ struct LocationsSettings: View {
                 ForEach(instances) { instance in
                     AccountsNavigationLink(instance: instance)
                 }
+                AddPublicInstanceButton()
                 addInstanceButton
             #endif
         }