Skip GPU-dependent tests when Vulkan/OpenGL backend is unavailable in CI

tests/gtest/dynamic_render_backend_test.cpp

@@ -45,7 +45,9 @@ TEST(DynamicRenderBackend, OpenGLBackendFollowsAdapterToRenderThread)
 #else
 	olive::DynamicRenderer renderer(QStringLiteral("opengl"));
 	ASSERT_TRUE(renderer.Load());
-	ASSERT_TRUE(renderer.Init());
+	if (!renderer.Init()) {
+		GTEST_SKIP() << "OpenGL backend could not be initialized on this system";
+	}
 
 	QThread render_thread;
 	renderer.moveToThread(&render_thread);