Adding msys2-based windows workflow

.github/workflows/msys2.yml

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+# SPDX-FileCopyrightText: 2025 Ledger SAS
+# SPDX-License-Identifier: Apache-2.0
+
+name: Sentry kernel build on Windows
+
+on:
+  workflow_dispatch:
+  push:
+  pull_request:
+    branches:
+    - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+# using /home/build as home, as buildbot is using user build. Cache is still in /cache
+# This allows the usage of automated ssh key installation step
+
+jobs:
+  build:
+    name: build
+    defaults:
+      run:
+        shell: bash
+    runs-on: windows-latest
+    steps:
+      - name: install prerequisites pkg
+        uses: msys2/setup-msys2@v2
+        with:
+          msystem: MINGW64
+          update: true
+          install: >-
+            base-devel
+            git
+            wget
+            curl
+            dtc
+            libssh2
+            cmake
+            gcc
+            ninja
+            brotli
+            libffi
+            libffi-devel
+            mingw-w64-x86_64-python
+            mingw-w64-x86_64-python-pip
+            mingw-w64-x86_64-python-lxml
+            mingw-w64-x86_64-python-lief
+            mingw-w64-x86_64-python-wheel
+            mingw-w64-x86_64-python-pillow
+            mingw-w64-x86_64-python-lief
+            mingw-w64-x86_64-python-cffi
+      - name: XXX git permission quirk XXX
+        run: |
+          git config --global --add safe.directory $GITHUB_WORKSPACE
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          fetch-tags: true
+          set-safe-directory: true
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+      - name: Clone cross-files
+        uses: actions/checkout@v4
+        with:
+          ref:  'main'
+          repository: 'outpost-os/meson-cross-files'
+          path: crossfiles
+      - name: Setup Rust toolchain
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: nightly
+          targets: thumbv7m-none-eabi,thumbv7em-none-eabi,thumbv7em-none-eabihf
+          components: clippy,rustfmt
+      - name: Setup C toolchain
+        uses: outpost-os/action-setup-compiler@v1
+        with:
+          compiler: gcc
+          triple: arm-none-eabi
+          ref: 13.2.Rel1
+          workspace: $GITHUB_WORKSPACE
+      - name: deploy local deps
+        run: |
+          pip config set global.break-system-packages true
+          pip install meson~=1.4.0 kconfiglib~=14.1.0 svd2json>=0.1.6 dts-utils>=0.3.0 jinja-cli GitPython>=3.1.0
+        shell: msys2 {0}
+      - name: defconfig
+        run: |
+          defconfig configs/nucleo_u5a5_autotest_defconfig
+        shell: msys2 {0}
+      - name: Meson Build
+        uses: outpost-os/action-meson@main
+        with:
+          cross_files: 'support/meson/msys2.ini'
+          actions: '["prefetch", "setup", "compile"]'
+          options: '-Dconfig=.config -Ddts=dts/examples/nucleo_u5a5_autotest.dts -Ddts-include-dirs=dts'
+          shell: msys2 {0}
+      - name: Meson postcheck
+        if: failure()
+        run: |
+          cat builddir/meson-logs/meson-log.txt

support/meson/msys2.ini

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+[constants]
+# Gcc triple, no diff between various arm-none-eabi targets, using
+# supplementary arguments to precise
+cross_triple = 'arm-none-eabi'
+# llvm triple, target-explicit, needed by Rust
+cross_toolchain = 'C:\Users\runneradmin\gcc-arm-none-eabi-13.2.1-win32-x64\arm-gnu-toolchain-13.2.Rel1-mingw-w64-i686-arm-none-eabi\'
+cross_compile = cross_toolchain + 'bin\' + cross_triple + '-'
+
+[host_machine]
+system = 'baremetal'
+cpu_family = 'arm'
+cpu = 'cortex-m4'
+endian = 'little'
+exe_wrapper = 'qemu-arm-static'
+
+[binaries]
+c = cross_compile + 'gcc'
+cpp = cross_compile + 'g++'
+ar = cross_compile + 'gcc-ar'
+ranlib = cross_compile + 'gcc-ranlib'
+strip = cross_compile + 'strip'
+objcopy = cross_compile + 'objcopy'
+clang = 'clang'
+rust_ld = 'gcc'
+rust = 'rustc'
+pkg-config = 'pkg-config'
+
+[properties]
+sysroot = cross_toolchain + cross_triple