workflow: cross build backend

.github/workflows/backend.yml

@@ -36,3 +36,18 @@ jobs:
           cmake -DCMAKE_BUILD_TYPE=RELEASE .
           make && sudo make install
           ttyd -v
+  cross:
+    runs-on: ubuntu-16.04
+    strategy:
+      matrix:
+        arch: [i386, x86_64, arm, armhf, mips, mipsel]
+    steps:
+      - uses: actions/checkout@v1
+      - name: cross build - ${{ matrix.arch }}
+        env:
+          ARCH: ${{ matrix.arch }}
+        run: docker run --rm -v $(pwd):/ttyd -w /ttyd tsl0922/musl-cross ./scripts/cross-build.sh $ARCH
+      - uses: actions/upload-artifact@v1
+        with:
+          name: ttyd.${{ matrix.arch }}
+          path: build/ttyd