add github workflow

.github/workflows/ci.yml

@@ -17,25 +17,31 @@ jobs:
           make
 
   mingw-cross:
+    strategy:
+      matrix:
+        arch: [i686, x86_64]
+        include:
+          - arch: i686
+            os: mingw32
+          - arch: x86_64
+            os: mingw64
     runs-on: ubuntu-latest
     steps:
       - name: Install cross compiler
         run: |
-          sudo apt-get install g++-mingw-w64-x86-64
-      - name: Checkout libfdk-aac
-        uses: actions/checkout@v3
-        with:
-          repository: mstorsjo/fdk-aac
-      - name: Build libfdk-aac
+          ARCH=${{ matrix.arch }}
+          sudo apt-get install g++-mingw-w64-${ARCH//_/-}
+      - name: Install libfdk-aac binary from repo.msys.org
         run: |
-          ./autogen.sh
-          ./configure --host=x86_64-w64-mingw32 --prefix=/usr/x86_64-w64-mingw32
-          make
-          sudo make install
+          wget https://repo.msys2.org/mingw/${{ matrix.os }}/${{ matrix.os }}.db.tar.zst
+          DESCFILE=$(tar xvf ${{ matrix.os }}.db.tar.zst --wildcards '*-fdk-aac*/desc')
+          PKGFILE=$(sed -n '/%FILENAME%/{n;p;q}' $DESCFILE)
+          wget https://repo.msys2.org/mingw/${{ matrix.os }}/${PKGFILE}
+          sudo tar xvf ${PKGFILE} -C /usr/${{ matrix.arch }}-w64-mingw32 --strip-component=1
       - name: Checkout
         uses: actions/checkout@v3
       - name: Build
         run: |
           autoreconf -fiv
-          ./configure --host=x86_64-w64-mingw32
+          ./configure --host=${{ matrix.arch }}-w64-mingw32
           make