fix(bundler): make .desktop and .DirIcon relative symlinks (#15596)

* fix(bundler): make .desktop and .DirIcon relative symlinks

* fmt

* Update .changes/appimage-diricon.md

Co-authored-by: Tony <68118705+Legend-Master@users.noreply.github.com>

* Update .changes/appimage-diricon.md

---------

Co-authored-by: Tony <68118705+Legend-Master@users.noreply.github.com>

Author: FabianLars

.changes/appimage-diricon.md

@@ -0,0 +1,7 @@
+---
+tauri-bundler: patch:bug
+tauri-cli: patch:bug
+"@tauri-apps/cli": patch:bug
+---
+
+Fixed an issue in the AppImage bundler that caused the `/.desktop` and `.DirIcon` files to be absolute symlinks instead of relative symlinks which caused problems with AppImage installers like `AppManager`.

crates/tauri-bundler/src/bundle/linux/appimage/linuxdeploy.rs

@@ -171,12 +171,9 @@ pub fn bundle_project(settings: &Settings) -> crate::Result<Vec<PathBuf>> {
     app_dir_path.join(larger_icon_path),
     app_dir_path.join(format!("{product_name}.png")),
   )?;
+  std::os::unix::fs::symlink(format!("{product_name}.png"), app_dir_path.join(".DirIcon"))?;
   std::os::unix::fs::symlink(
-    app_dir_path.join(format!("{product_name}.png")),
-    app_dir_path.join(".DirIcon"),
-  )?;
-  std::os::unix::fs::symlink(
-    app_dir_path.join(format!("usr/share/applications/{product_name}.desktop")),
+    format!("usr/share/applications/{product_name}.desktop"),
     app_dir_path.join(format!("{product_name}.desktop")),
   )?;