** in docker code example
Example 1: docker ARG
$ docker build --build-arg some_variable_name=a_valueExample 2: dockerfile example
FROM ubuntu:18.04
COPY . /app
RUN make /app
CMD python /app/app.py$ docker build --build-arg some_variable_name=a_valueFROM ubuntu:18.04
COPY . /app
RUN make /app
CMD python /app/app.py