How can a variable that changes during CI/CD execution be passed into the Docker image build process?

To pass a variable that changes during CI/CD execution into the Docker image build process, you can use build arguments.

For example, in the Dockerfile, declare an argument:

ARG VARIABLE_NAME
RUN echo "Variable is $VARIABLE_NAME"

When running the build in the CI/CD pipeline, pass the value:

docker build --build-arg VARIABLE_NAME=${VARIABLE_NAME} .

Where ${VARIABLE_NAME} is an environment variable or a parameter set in the CI/CD system.

This allows dynamically changing build parameters without modifying the Dockerfile. Arguments are only available during the build and do not become environment variables in the final image.