GitHub: install `ninja-build` on Ubuntu #654

Job	Run time
Android (Ubuntu)	5m 10s
cmake-build-macos (macOS - Clang (Xcode), macos-latest, Debug, clang, clang++, Xcode, -DLVK_WITH_...	2m 22s
cmake-build (Windows - MSVC 2022 (glslang), windows-latest, Debug, cl, cl, Visual Studio 17 2022,...	3m 15s
cmake-build (Windows - MSVC 2022 (Slang), windows-latest, Debug, cl, cl, Visual Studio 17 2022, -...	8m 11s
cmake-build (Ubuntu - Clang, ubuntu-latest, Debug, clang-15, clang++-15, Unix Makefiles)	3m 27s
cmake-build (Ubuntu - Clang (Wayland), ubuntu-latest, Debug, clang-15, clang++-15, Unix Makefiles...	4m 13s
	26m 38s

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