ci: Use SDK build image MinGW-w64 installation

This commit updates the CI workflow to use the more up-to-date MinGW-w64
toolchain (MinGW 12.0.0, Binutils 2.42, GCC 13.2.0) from the SDK build
Docker image instead of installing the outdated distro default version.

Note that MinGW 12.0.0 defaults to UCRT on Windows.

Signed-off-by: Stephanos Ioannidis <[email protected]>

Author: stephanosio

.github/workflows/ci.yml

@@ -475,9 +475,9 @@ jobs:
 
         # Install dependencies for cross compilation
         if [ "${{ matrix.host.name }}" == "windows-x86_64" ]; then
-          # Install MinGW-w64 cross toolchain
-          sudo apt-get install -y binutils-mingw-w64 gcc-mingw-w64 \
-                                  g++-mingw-w64
+          # Make MinGW-w64 win32 cross toolchain available in PATH
+          echo "/opt/mingw-w64-win32/bin" >> $GITHUB_PATH
+          export PATH="/opt/mingw-w64-win32/bin:$PATH"
 
           # Build and install libboost-regex for MinGW-w64 host
           ## Check out Boost library source code
@@ -833,9 +833,8 @@ jobs:
 
         # Install dependencies for cross compilation
         if [ "${{ matrix.host.name }}" == "windows-x86_64" ]; then
-          # Install MinGW-w64 cross toolchain
-          sudo apt-get install -y binutils-mingw-w64 gcc-mingw-w64 \
-                                  g++-mingw-w64
+          # Make MinGW-w64 posix cross toolchain available in PATH
+          echo "/opt/mingw-w64-posix/bin" >> $GITHUB_PATH
         fi
 
         # Set environment variables