What is an example of Dockerfile for the enviroment variable APPENDIX_FILE

[nasiegel88]

I have a Makefile that I would like to run after my repo2docker image is built. I see in the documentation that this can be accomplished by using as APPENDIX_FILE in my Github action. When I run this locally the command I run is jupyter-repo2docker --editable . make. When I add a Dockerfile with the command and test the workflow using act I see the below in my output

::group::Validate Information
| Appendix read from Dockerfile:\nCMD make
| Using default tag: latest

So the command is recognized but I am not seeing the output locally.

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