Add mingw CI build setup.

.github/workflows/mingw.yml

@@ -0,0 +1,33 @@
+name: build-mingw
+
+on:
+  workflow_dispatch:
+
+env:
+  CPM_SOURCE_CACHE: ${{ github.workspace }}/cpm-cache
+
+jobs:
+  build-mingw:
+    runs-on: ubuntu-latest
+    container: archlinux:base-devel
+    steps:
+    - name: Install dependencies
+      run: |
+        pacman -Syu --noconfirm
+        pacman -S --noconfirm --needed mingw-w64-gcc cmake git nodejs
+    - name: Trust git repo
+      run: git config --global --add safe.directory '*'
+    - uses: actions/checkout@v4
+    - name: Cache CPM packages
+      uses: actions/cache@v4
+      with:
+        path: ${{ env.CPM_SOURCE_CACHE }}
+        key: ${{ runner.os }}-cpm-${{ hashFiles('**/vendor.cmake', '**/CMakeLists.txt') }}
+        restore-keys: ${{ runner.os }}-cpm-
+    - name: Build TracyClient
+      run: |
+        cmake -B build -DCMAKE_BUILD_TYPE=Release \
+          -DCMAKE_SYSTEM_NAME=Windows \
+          -DCMAKE_C_COMPILER=x86_64-w64-mingw32-gcc \
+          -DCMAKE_CXX_COMPILER=x86_64-w64-mingw32-g++
+        cmake --build build