fix(compose): report an empty Compose file as empty, not as not found

Closes #12477

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.changes/wrong-docker-compose-file-not-found.md

@@ -0,0 +1,6 @@
+---
+type: fixed
+---
+Wrong `Docker Compose file not found` error for an empty Compose file ([#12477](https://github.com/coollabsio/coolify/issues/12477))
+
+- An empty Compose file now gives an error that says that the file is empty

app/Models/Application.php

@@ -2823,7 +2823,7 @@ class Application extends BaseModel
             $this->base_directory = $initialBaseDirectory;
             $this->save();
 
-            throw new RuntimeException("Docker Compose file not found at: $workdir$composeFile (branch: {$this->git_branch})<br><br>Check if you used the right extension (.yaml or .yml) in the compose file name.");
+            throw new RuntimeException("Docker Compose file at $workdir$composeFile (branch: {$this->git_branch}) is empty.<br><br>Check that the file in the repository has content and that your changes are committed and pushed.");
         }
     }
 

tests/Feature/ComposeFileLoadErrorTest.php

@@ -86,3 +86,21 @@ it('tells the user that a symlinked Compose file is not loaded', function () {
         ->toThrow(RuntimeException::class, 'Docker Compose file at /docker-compose.yml (branch: main) is a symbolic link.');
     expect($this->application->fresh()->docker_compose_raw)->toBe("services:\n  web:\n    image: nginx\n");
 });
+
+it('tells the user that the Compose file is empty, not that it is missing', function () {
+    fakeComposeLoadServer(null, '');
+
+    expect(fn () => $this->application->loadComposeFile())
+        ->toThrow(function (RuntimeException $exception) {
+            expect($exception->getMessage())
+                ->toContain('Docker Compose file at /docker-compose.yml (branch: main) is empty.')
+                ->not->toContain('not found');
+        });
+});
+
+it('tells the user that the Compose file is missing', function () {
+    fakeComposeLoadServer('git ls-tree', 'No such file');
+
+    expect(fn () => $this->application->loadComposeFile())
+        ->toThrow(RuntimeException::class, 'Docker Compose file not found at: /docker-compose.yml (branch: main)');
+});