ci: WIP: add a windows-latest build

.github/workflows/ci.yml

@@ -13,18 +13,20 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     timeout-minutes: 60
     steps:
     - uses: actions/checkout@v4
       with:
         fetch-depth: 0
-    - uses: cachix/install-nix-action@v30
+    - if: matrix.os != 'windows-latest'
+      uses: cachix/install-nix-action@v30
       with:
         # The sandbox would otherwise be disabled by default on Darwin
         extra_nix_config: "sandbox = true"
-    - run: echo CACHIX_NAME="$(echo $GITHUB_REPOSITORY-install-tests | tr "[A-Z]/" "[a-z]-")" >> $GITHUB_ENV
+    - if: matrix.os != 'windows-latest'
+      run: echo CACHIX_NAME="$(echo $GITHUB_REPOSITORY-install-tests | tr "[A-Z]/" "[a-z]-")" >> $GITHUB_ENV
     - uses: cachix/cachix-action@v15
       if: needs.check_secrets.outputs.cachix == 'true'
       with:
@@ -48,8 +50,61 @@ jobs:
             free -h
           done
         ) &
-    - run: nix --experimental-features 'nix-command flakes' flake check -L
-    - run: nix --experimental-features 'nix-command flakes' flake show --all-systems --json
+
+    - if: matrix.os != 'windows-latest'
+      run: nix --experimental-features 'nix-command flakes' flake check -L
+    - if: matrix.os != 'windows-latest'
+      run: nix --experimental-features 'nix-command flakes' flake show --all-systems --json
+
+    # We don't have a fully working nix.exe yet, but we'd like to run functional tests
+    # For now, we can build using mingw64 and run the tests.
+    - if: matrix.os == 'windows-latest'
+      uses: msys2/setup-msys2@v2
+      with:
+        msystem: mingw64
+        install: >-
+          autoconf-archive
+          autoconf-wrapper
+          automake-wrapper
+          bison
+          flex
+          git
+          make
+          patch
+          mingw-w64-x86_64-boost
+          mingw-w64-x86_64-brotli
+          mingw-w64-x86_64-cmake
+          mingw-w64-x86_64-curl
+          mingw-w64-x86_64-gc
+          mingw-w64-x86_64-gcc
+          mingw-w64-x86_64-gtest
+          mingw-w64-x86_64-jq
+          mingw-w64-x86_64-libarchive
+          mingw-w64-x86_64-libsodium
+          mingw-w64-x86_64-meson
+          mingw-w64-x86_64-nlohmann-json
+          mingw-w64-x86_64-openssl
+          mingw-w64-x86_64-pkgconf
+          mingw-w64-x86_64-readline
+          mingw-w64-x86_64-sqlite3
+    - if: matrix.os == 'windows-latest'
+      shell: msys2 {0}
+      run: |
+        pushd /tmp
+        git clone -b nix-dependencies https://github.com/nix-windows/MINGW-packages.git
+        pushd MINGW-packages
+        pushd mingw-w64-toml11
+        makepkg-mingw -sCLfi --noconfirm --nocheck
+        popd
+        pushd mingw-w64-libgit2
+        makepkg-mingw -sCLfi --noconfirm --nocheck
+        popd
+        popd
+        popd
+
+        meson setup build -Dlibutil:cpuid=disabled -Dlibcmd:readline-flavor=readline -Ddoc-gen=false -Dunit-tests=false -Dbindings=false
+        cd build
+        meson test
 
   # Steps to test CI automation in your own fork.
   # Cachix: