Add GHA workflows for building on Ubuntu

Building on Windows would require getting glslang binary from somewhere...

.github/workflows/build.yml

@@ -0,0 +1,29 @@
+name: build
+
+on: [push, pull_request]
+
+jobs:
+    build:
+        strategy:
+            matrix:
+                os: [ubuntu]
+        name: ${{matrix.os}}
+        runs-on: ${{matrix.os}}-latest
+        steps:
+            - uses: actions/checkout@v4
+              with:
+                  submodules: true
+            - uses: actions/checkout@v4
+              with:
+                  repository: KhronosGroup/Vulkan-Headers
+                  ref: main
+                  path: Vulkan-Headers
+            - name: install deps
+              run: |
+                  sudo apt install -y glslang-tools ninja-build
+            - name: cmake
+              run: |
+                  export VULKAN_SDK=~/Vulkan-Headers
+                  cmake . -G Ninja
+            - name: build
+              run: ninja