Add i686-pc-windows-gnu CI

Author: mati865

.github/workflows/ci.yml

@@ -110,7 +110,7 @@ jobs:
   installation:
     strategy:
       matrix:
-        build: [ win-msvc, win-gnu, win32-msvc ]
+        build: [ win-msvc, win-gnu, win32-msvc, win32-gnu ]
         include:
           - build: win-msvc
             os: windows-latest
@@ -124,6 +124,10 @@ jobs:
             os: windows-latest
             rust: stable
             target: i686-pc-windows-msvc
+          - build: win32-gnu
+            os: windows-latest
+            rust: stable
+            target: i686-pc-windows-gnu
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3
@@ -133,10 +137,16 @@ jobs:
           toolchain: ${{ matrix.rust }}
           targets: ${{ matrix.target }}
       - uses: Swatinem/rust-cache@v2
+      - uses: msys2/setup-msys2@v2
+        with:
+          msystem: MINGW${{ startsWith(matrix.target, 'i686-') && '32' || '64' }}
+          pacboy: cc:p
+          path-type: inherit
       - name: "Install prerequisites"
         run: vcpkg install  zlib:x64-windows-static-md
       - name: "Installation from crates.io: gitoxide"
         run: cargo +${{ matrix.rust }} install --target ${{ matrix.target }} --target-dir install-artifacts --debug --force gitoxide
+        shell: msys2 {0}
 
   lint:
     runs-on: ubuntu-latest