Add 64-bit ARM (aarch64) build (#275)

.github/workflows/backend.yml

@@ -42,7 +42,7 @@ jobs:
     runs-on: ubuntu-16.04
     strategy:
       matrix:
-        arch: [i386, x86_64, arm, armhf, mips, mipsel]
+        arch: [i386, x86_64, arm, armhf, aarch64, mips, mipsel]
     steps:
       - uses: actions/checkout@v1
       - name: Cross build (${{ matrix.arch }})

.github/workflows/release.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Build Release
         run: |
           mkdir -p bin
-          for arch in i386 x86_64 arm armhf mips mipsel; do
+          for arch in i386 x86_64 arm armhf aarch64 mips mipsel; do
             docker run --rm -v $(pwd):/ttyd -w /ttyd tsl0922/musl-cross ./scripts/cross-build.sh $arch
             cp build/ttyd bin/ttyd_linux.$arch
             sha256sum bin/ttyd_linux.$arch >> bin/SHA256SUMS