Addition of Nix flake development shell (#4184)

* Initial devshell creation.

* cmake has a check for clang and therefore override the stdenv.

* Packages from old shell were renamed.

* fixed xcb-util, added libglvnd

* Added sdl3 dependencies provided by the website given on cmake configuration.

* Lock file.

* Nix format.

* Added instructions for entering nix development shell.

.

* Added libuuid

* Added copyright text to flake.nix

* Added flake.lock to REUSE.toml as is a JSON file without comment support.

* Updated instructions to refer to new build name.

* Compiling however not yet correctly linking with debug derivation.

* Hitting installPhase

* Added nix result symlink.

* correctly installs in place

* Added a wrapper to load vulkan and ligl into environment.

* Ensure that the name is applicable to the current project.

.

* Added mesa to LD_LIBRARY_PATH

* game now launching with added X11 libraries.

* Cleanup

Formatting.

Pulled cmakeFlags to top and added releaseWithDebugInfo

Removed LD_LIBRARY_PATH from devshell.

.

* Added options for the different Nix build modes.

* Debug / release mode flag cannot be bundled into one.

documents/building-linux.md

@@ -53,6 +53,23 @@ sudo zypper install clang git cmake libasound2 libpulse-devel \
 nix-shell shell.nix
 ```
 
+#### Nix Flake Development Shell
+```bash
+nix develop
+cmake -S . -B build/ -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_EXPORT_COMPILE_COMMANDS=ON  
+ln -s ./build/compile_commands.json .
+```
+
+#### Nix Flake Build
+```bash
+nix build .?submodules=1#linux.debug
+```
+```bash
+nix build .?submodules=1#linux.release
+```
+```bash
+nix build .?submodules=1#linux.releaseWithDebugInfo
+```
 #### Other Linux distributions
 
 You can try one of two methods: