Try to add 32-bit build for Windows / mingw CI

.github/workflows/github.yml

@@ -126,6 +126,16 @@ jobs:
             cmake_args: -G Ninja
             preset: windows-mingw-conan-linux
             conan_profile: mingw64-linux.jinja
+          - platform: mingw-ubuntu-32
+            os: ubuntu-22.04
+            test: 0
+            pack: 1
+            pack_type: Release
+            extension: exe
+            cpack_args: -D CPACK_NSIS_EXECUTABLE=`which makensis`
+            cmake_args: -G Ninja
+            preset: windows-mingw-conan-linux
+            conan_profile: mingw32-linux.jinja
           - platform: android-32
             os: ubuntu-22.04
             extension: apk

CI/mingw-ubuntu-32/before_install.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+sudo apt-get update
+sudo apt-get install ninja-build mingw-w64 nsis
+sudo update-alternatives --set i686-w64-mingw32-g++ /usr/bin/i686-w64-mingw32-g++-posix
+
+# Workaround for getting new MinGW headers on Ubuntu 22.04.
+# Remove it once MinGW headers version in repository will be 10.0 at least
+curl -O -L http://mirrors.kernel.org/ubuntu/pool/universe/m/mingw-w64/mingw-w64-common_10.0.0-3_all.deb \
+  && sudo dpkg -i mingw-w64-common_10.0.0-3_all.deb;
+curl -O -L http://mirrors.kernel.org/ubuntu/pool/universe/m/mingw-w64/mingw-w64-i686-dev_10.0.0-3_all.deb \
+  && sudo dpkg -i mingw-w64-i686-dev_10.0.0-3_all.deb;
+
+mkdir ~/.conan ; cd ~/.conan
+curl -L "https://github.com/vcmi/vcmi-deps-windows-conan/releases/download/1.0/vcmi-deps-windows-conan-w32.tgz" \
+	| tar -xzf -