Enhance webdrop-bridge cask with macOS dependency and post-installation instructions

Casks/webdrop-bridge.rb

@@ -16,6 +16,13 @@ cask "webdrop-bridge" do
 
   app "WebDropBridge.app"
 
+  depends_on macos: ">= :monterey"
+
+  postflight do
+    system_command "/usr/bin/xattr",
+                   args: ["-dr", "com.apple.quarantine", "#{staged_path}/WebDropBridge.app"]
+  end
+
   uninstall quit: "de.him_tools.webdrop-bridge"
 
   zap trash: [
@@ -31,6 +38,11 @@ cask "webdrop-bridge" do
     Configuration files are stored in: ~/.webdrop-bridge/
     Logs are written to: ~/.webdrop-bridge/logs/
 
+    NOTE: The app is not signed with an Apple Developer certificate.
+    If macOS still blocks the first launch, right-click the app in
+    /Applications and choose "Open", then confirm in the dialog.
+    Alternatively: sudo xattr -dr com.apple.quarantine /Applications/WebDropBridge.app
+
     For documentation: https://git.him-tools.de/HIM-public/webdrop-bridge
   EOS
 end