workflow: add docker build and push job

.github/workflows/docker.yml

@@ -0,0 +1,45 @@
+name: docker
+
+on:
+  push:
+    branches: master
+
+jobs:
+  docker:
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install packages
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y autoconf automake build-essential cmake curl file libtool
+      - name: Cross build amd64/arm64 binary
+        run: |
+          for arch in amd64 arm64; do
+            env BUILD_TARGET=$arch ./scripts/cross-build.sh
+            cp build/ttyd ttyd.$arch
+          done
+      - uses: docker/setup-qemu-action@v1
+      - uses: docker/setup-buildx-action@v1
+      - uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_HUB_USER }}
+          password: ${{ secrets.DOCKER_HUB_TOKEN }}
+      - name: build/push docker image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: |
+            tsl0922/ttyd:latest
+      - name: build/push docker image (alpine)
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./Dockerfile.alpine
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: |
+            tsl0922/ttyd:alpine

Dockerfile

@@ -1,16 +1,11 @@
-FROM ubuntu:18.04
-RUN apt-get update && apt-get install -y autoconf automake curl cmake git libtool make \
-    && git clone --depth=1 https://github.com/tsl0922/ttyd.git /ttyd \
-    && cd /ttyd && env BUILD_TARGET=x86_64 ./scripts/cross-build.sh
+FROM ubuntu:20.04
 
-FROM ubuntu:18.04
-COPY --from=0 /ttyd/build/ttyd /usr/bin/ttyd
-
-ADD https://github.com/krallin/tini/releases/download/v0.18.0/tini /sbin/tini
-RUN chmod +x /sbin/tini
+ARG TARGETARCH
+COPY ./ttyd.${TARGETARCH} /usr/bin/ttyd
+RUN apt-get update && apt-get install -y --no-install-recommends tini && rm -rf /var/lib/apt/lists/*
 
 EXPOSE 7681
 WORKDIR /root
 
-ENTRYPOINT ["/sbin/tini", "--"]
+ENTRYPOINT ["/usr/bin/tini", "--"]
 CMD ["ttyd", "bash"]

Dockerfile-alpine

@@ -1,14 +0,0 @@
-FROM ubuntu:18.04
-RUN apt-get update && apt-get install -y autoconf automake curl cmake git libtool make \
-    && git clone --depth=1 https://github.com/tsl0922/ttyd.git /ttyd \
-    && cd /ttyd && env BUILD_TARGET=x86_64 ./scripts/cross-build.sh
-
-FROM alpine
-COPY --from=0 /ttyd/build/ttyd /usr/bin/ttyd
-RUN apk add --no-cache bash tini
-
-EXPOSE 7681
-WORKDIR /root
-
-ENTRYPOINT ["/sbin/tini", "--"]
-CMD ["ttyd", "bash"]

Dockerfile.alpine

@@ -0,0 +1,11 @@
+FROM alpine
+
+ARG TARGETARCH
+COPY ./ttyd.${TARGETARCH} /usr/bin/ttyd
+RUN apk add --no-cache bash tini
+
+EXPOSE 7681
+WORKDIR /root
+
+ENTRYPOINT ["/sbin/tini", "--"]
+CMD ["ttyd", "bash"]

scripts/cross-build.sh

@@ -153,6 +153,9 @@ build() {
     build_ttyd
 }
 
+[ "${BUILD_TARGET}" = "amd64" ] && BUILD_TARGET="x86_64"
+[ "${BUILD_TARGET}" = "arm64" ] && BUILD_TARGET="aarch64"
+
 case ${BUILD_TARGET} in
     i686|x86_64|aarch64|mips|mipsel|mips64|mips64el)
         build "${BUILD_TARGET}-linux-musl" "${BUILD_TARGET}"