nixos/ollama: add vulkan acceleration option

nixos/modules/services/misc/ollama.nix

@@ -103,6 +103,7 @@ in
             false
             "rocm"
             "cuda"
+            "vulkan"
           ]
         );
         default = null;
@@ -119,6 +120,7 @@ in
             - may require overriding gpu type with `services.ollama.rocmOverrideGfx`
               if rocm doesn't detect your AMD gpu
           - `"cuda"`: supported by most modern NVIDIA GPUs
+          - `"vulkan"`: supported by most modern GPUs on Linux
         '';
       };
       rocmOverrideGfx = lib.mkOption {

nixos/tests/all-tests.nix

@@ -1136,6 +1136,7 @@ in
   ollama = runTest ./ollama.nix;
   ollama-cuda = runTestOn [ "x86_64-linux" "aarch64-linux" ] ./ollama-cuda.nix;
   ollama-rocm = runTestOn [ "x86_64-linux" "aarch64-linux" ] ./ollama-rocm.nix;
+  ollama-vulkan = runTestOn [ "x86_64-linux" "aarch64-linux" ] ./ollama-vulkan.nix;
   ombi = runTest ./ombi.nix;
   omnom = runTest ./omnom;
   oncall = runTest ./web-apps/oncall.nix;

nixos/tests/ollama-vulkan.nix

@@ -0,0 +1,17 @@
+{ lib, ... }:
+{
+  name = "ollama-vulkan";
+  meta.maintainers = with lib.maintainers; [ abysssol ];
+
+  nodes.vulkan =
+    { ... }:
+    {
+      services.ollama.enable = true;
+      services.ollama.acceleration = "vulkan";
+    };
+
+  testScript = ''
+    vulkan.wait_for_unit("multi-user.target")
+    vulkan.wait_for_open_port(11434)
+  '';
+}