Add workflow checking that deployed repository can produce "Hello Wor…

…ld!" executable

.github/scripts/install-toolchain.sh

@@ -0,0 +1,8 @@
+pacman -Syu --noconfirm
+
+cat "[woarm64]
+  Server = https://windows-on-arm-experiments.github.io/msys2-woarm64-build/$arch
+  SigLevel = Optional" >> /etc/pacman.conf
+
+pacman -Sy
+pacman -S mingw-w64-cross-gcc

.github/workflows/check-repository.yml

@@ -0,0 +1,24 @@
+name: Check MSYS2 repository
+
+on:
+  workflow_dispatch:
+
+jobs:
+  check-repository:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: msys2/setup-msys2@v2
+        with:
+          msystem: MSYS
+          location: ${{ github.workspace }}
+          release: true
+          update: true
+          cache: false
+          install: base-devel
+
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - shell: msys2 {0}
+        run: |
+          .github/workflows/install-toolchain.sh