dockerfile copy command code example
Example 1: docker ARG
$ docker build --build-arg some_variable_name=a_value
Example 2: dockerfile example
FROM ubuntu:18.04
COPY . /app
RUN make /app
CMD python /app/app.py
Example 3: dockerfile copy specific files
COPY ["__BUILD_NUMBER", "README.md", "gulpfile", "another_file", "./"]
All the files and folders, the last is destination