Add a lambda-acl target

[rderbier]

Create a docker image with lambda server and acl enabled. Add a sample lambda files with test functions.

[joshua-goldstein]

Thanks @rderbier for looking into this, it looks good, I just had the one thought above. Also one question, this is not related to your PR since this also happens on the main branch, but when I run make up-with-lambda I see

$ make up-with-lambda
DGRAPH_VERSION=local docker-compose -f docker-compose.yml -f docker-compose-lambda.yml up -d && docker-compose logs --follow alpha zero lambda keepalive
[+] Building 0.0s (0/0)                                                                                                                              
[+] Running 6/6
...
no such service: lambda
make: *** [Makefile:9: up-with-lambda] Error 1

which seems to come down to the command docker-compose logs --follow lambda giving the error. Are you running into this also?

Again, not related to your PR, but if it is an issue I can look into it.

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