A very very simple Dockerfile

Dockerfile-v1

# version 1
# Base on alpine OS 
FROM alpine:latest 

# 
WORKDIR /user/local/bin 

# Make simple hello script
RUN echo "echo \"Hello Alpine\"" > ./hello.sh 
RUN chmod u+x *.sh

# Run the hello script 
ENTRYPOINT ["sh", "./hello.sh"]

Dockerfile-v2

# Version 2
# Base on alpine OS 
FROM alpine:latest 

# 
WORKDIR /user/local/bin 

# Make simple hello script
RUN echo "echo \"Hello Alpine `date` \"" > ./hello.sh 
RUN chmod u+x *.sh

# Run the hello script 
ENTRYPOINT ["sh", "./hello.sh"]