Actions: add Windows

.github/workflows/build.yml

@@ -51,6 +51,31 @@ jobs:
         run: shasum -a256 /home/runner/work/feather/feather/build/feather.AppImage
       - uses: actions/upload-artifact@v2
         with:
-          name: feather.AppImage
+          name: ${{ github.job }}
           path: |
             /home/runner/work/feather/feather/build/feather.AppImage
+
+  docker-windows-static:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v1
+        with:
+          submodules: recursive
+      - uses: satackey/action-docker-layer-caching@v0.0.11
+        if: "!startsWith(github.ref, 'refs/tags/v')"
+        continue-on-error: true
+        with:
+          key: docker-linux-static-{hash}
+          restore-keys: |
+            docker-linux-static-
+      - name: prepare build environment
+        run: docker build -f Dockerfile.windows --tag feather:win --build-arg THREADS=3 .
+      - name: build
+        run: docker run --rm -v $PWD:/feather -w /feather feather:win sh -c 'make release-static-windows root=/depends target=x86_64-w64-mingw32 tag=win-x64 -j3'
+      - name: sha256sum
+        run: shasum -a256 /home/runner/work/feather/feather/build/release/bin/feather.exe
+      - uses: actions/upload-artifact@v2
+        with:
+          name: ${{ github.job }}
+          path: |
+            /home/runner/work/feather/feather/build/release/bin/feather.exe