Add Makefile documentation

[ddelange]

Motivation

#38 (comment)

Modifications

Add help texts

Result

all                       - Alias for `build`
build                     - Build runtime docker image
develop                   - Build develop docker image and run an interactive shell in the develop envionment
fmt                       - Run formatting
help                      - Print Makefile documentation
run                       - Build develop docker image and run a make command in the develop envionment (e.g. `make run fmt` will execute `make fmt` within the docker container)
test                      - Run tests

[ddelange]

cc @ckadner

[ckadner]

cc @ckadner

Thanks @ddelange this is great. I will add a more detailed review soon.

[ddelange]

friendly ping @ckadner :)

[ckadner]

Thank you @ddelange -- appologies for the long wait.

I have a few minor wording suggestions and a regex improvement :-)

[ckadner]

What do you think about shortening the first column and adding some color?

help:
	@perl -0 -nle 'printf("\033[36m  %-15s\033[0m %s\n", "$$2", "$$1") while m/^##\s*([^\r\n]+)\n^([\w.-]+):[^=]/gm' $(MAKEFILE_LIST) | sort

[ddelange]

@ckadner done in all three PRs 👍

[ckadner]

Thank you @ddelange

/lgtm

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ckadner, ddelange
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