tools/ci: add initial support for MSYS2

build.yml  -> add msys2 job

.github/workflows/build.yml

@@ -214,3 +214,71 @@ jobs:
           name: macos-builds
           path: buildartifacts/
         continue-on-error: true
+
+  msys2:
+    needs: Fetch-Source
+    runs-on: windows-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        boards: [msys2]
+
+    defaults:
+      run:
+        shell: msys2 {0}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: msys2/setup-msys2@v2
+        with:
+          msystem: MSYS
+          update: false
+          install: >-
+            base-devel
+            gcc
+            gperf
+            automake
+            autoconf
+            git
+            python3
+            ncurses-devel
+            unzip
+            zip
+            tio
+            zlib-devel
+            cmake
+            ninja
+            python-pip 
+            vim
+
+      - name: pip3 install
+        run: |
+          pip3 install --root-user-action=ignore --no-cache-dir pyelftools cxxfilt kconfiglib
+
+      - run: git config --global core.autocrlf false
+
+      - name: Download Source Artifact
+        uses: actions/download-artifact@v3
+        with:
+          name: source-bundle
+          path: .
+
+      - name: Extract sources
+        run: tar zxf sources.tar.gz
+
+      - name: Export NuttX Repo SHA
+        run: echo "nuttx_sha=`git -C sources/nuttx rev-parse HEAD`" >> $GITHUB_ENV
+
+      - name: Run Builds
+        run: |
+          echo "::add-matcher::sources/nuttx/.github/gcc.json"
+          export ARTIFACTDIR=`pwd`/buildartifacts
+          git config --global --add safe.directory /github/workspace/sources/nuttx
+          git config --global --add safe.directory /github/workspace/sources/apps
+          cd sources/nuttx/tools/ci
+          ./cibuild.sh -g -i -A -C -R testlist/${{matrix.boards}}.dat
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: msys2-builds
+          path: buildartifacts/
+        continue-on-error: true