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SETUP FILE [file ...] The SETUP FILE instruction causes the contents of the given file to be sourced before every RUN command. This is equivalent to copy/pasting the contents of the file into the terminal before every RUN command. A common use case is to set a lot of environment variables using an “.env” file, or specifying a custom “.bashrc” file.

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Example setup-script.sh

# contents of setup-script.sh
echo 'This will print before every RUN command'
# set the LOG_LEVEL environment variable to 'debug'
export LOG_LEVEL=debug
# load an .env file
source /root/.env

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Referencing setup-script.sh

Use SETUP FILE setup-script.sh to run source setup-script.sh before every RUN command.