`docker-compose build` fails because missing .env file.

[cowlicks]

It fails with:

Step 5/15 : RUN git clone -b $GIT_BRANCH_CORE --single-branch https://github.com/enigmampc/enigma-core.git
 ---> Running in 53b63f2b20c6
Cloning into 'enigma-core'...
fatal: Remote branch --single-branch not found in upstream origin
ERROR: Service 'core' failed to build: The command '/bin/sh -c git clone -b $GIT_BRANCH_CORE --single-branch https://github.com/enigmampc/enigma-core.git' returned a non-zero code: 128       

This happens because GIT_BRANCH_CORE isn't set. It used be set in the .env file, but this got renamed in d404931 to .env-template. It looks like the template file is used to create the env file in launch.bash, but that is run after docker-compose build (according to the current docs). It seems like either the docs need updating, or there should be a preset env file.

(FYI the building isn't finished for me so this might need an update)

[lacabra]

Hi @cowlicks, thanks for reporting this. I have updated the documentation on the README (f40e8f8) accordingly. No need to run docker-compose build separately, instead just start launching the network with launch.bash. When this script runs, it checks whether .env exists, and if it doesn't, it creates one from .env-template.