Add MinGW step to CI

.github/workflows/ci.yaml

@@ -17,7 +17,7 @@ jobs:
       - name: Install tools
         run: |
           sudo apt-get update -qq
-          sudo apt-get install -y build-essential clang clang-tools clang-tidy cppcheck
+          sudo apt-get install -y build-essential clang clang-tools clang-tidy cppcheck gcc-mingw-w64-x86-64
 
       - name: Build with GCC
         run: |
@@ -29,6 +29,11 @@ jobs:
           make -f Makefile.posix clean
           make -f Makefile.posix CC=clang CFLAGS="-std=c99 -Wall -Wextra -Wpedantic -Werror -O2"
 
+      - name: Build with MinGW
+        run: |
+          make -f Makefile.posix clean
+          make -f Makefile.mingw CC=x86_64-w64-mingw32-gcc AR=x86_64-w64-mingw32-ar CFLAGS="-std=c99 -Wall -Wextra -Wpedantic -Werror -O2"
+
       - name: Linting checks
         run: |
           echo "Running all linting checks..."