workflow: mingw build test

.github/workflows/mingw.yml

@@ -0,0 +1,17 @@
+name: Mingw build testing
+
+on: [push, pull_request]
+jobs:
+  build-mingw:
+    runs-on: ubuntu-latest
+    container:
+      image: archlinux:latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install prerequisites
+        run: |
+          pacman -Syu mingw-w64-gcc meson python-mako glslang mingw-w64-headers --noconfirm
+      - name: configure
+        run: meson setup --cross-file mingw64.txt build64
+      - name: build
+        run: ninja -C build64