Add GHA integration

.gitattributes

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+# Declare files that always have LF line endings on checkout
+* text eol=lf

.github/workflows/test.yml

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+name: build
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: windows-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: setup-msys2
+        uses: msys2/setup-msys2@v2
+        with:
+          msystem: MSYS
+          update: true
+          install: msys2-devel base-devel
+
+      - name: Build
+        shell: msys2 {0}
+        run: |
+          makepkg -Csfri --noconfirm --nocheck
+
+      - name: Upload
+        uses: actions/upload-artifact@v2
+        with:
+          name: package
+          path: '*.pkg.tar.*'