Update Dockerfile

Dockerfile

@@ -1,16 +1,14 @@
-FROM ubuntu:latest
+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
 
-# Install required packages
-RUN apt-get update && apt-get install -y curl bash
+FROM alpine
+COPY --from=0 /ttyd/build/ttyd /usr/bin/ttyd
+RUN apk add --no-cache bash tini
 
-# Fetch ttyd binary
-RUN curl -Lo ttyd https://github.com/tsl0922/ttyd/releases/download/1.7.3/ttyd.x86_64
-
-# Set permissions
-RUN chmod +x ttyd
-
-# Expose the desired port
 EXPOSE 7681
+WORKDIR /root
 
-# Start ttyd with the specified options
-CMD ["./ttyd", "--port", "7681", "bash"]
+ENTRYPOINT ["/sbin/tini", "--"]
+CMD ["ttyd", "bash"]