Fix/docker instructions

[uritau]

Purpose

This PR wants to solve some issues detected following the instructions in readme about Terraboard deployment using Docker (and docker-compose).

Detected issues

Error launching postgres container

waiting for server to start....postgres: invalid argument: "listen_addresses="
Try "postgres --help" for more information.
 stopped waiting
pg_ctl: could not start server
Examine the log output.

I think that this first issue could be related with this PR Remove deprecated links, use compose default network. The -d parameter in docker run should be for docker itself, not for postgres daemon, so let's move before the container call.
Trying to make the code a little bit more readable I suggest to use the long description --detach instead the short one -d.

Error launching terraboard container:

level=fatal msg="pq: SSL is not enabled on the server"

As far as adding SSL in the pgsql is not a trivial think I think that we can use DB_SSLMODE="disable" in docker and docker-compose. This issue is related with the one that @gssajith reports in PR #109. I think that the solution offered there it's better and more secure, but for "testing and development" purposes I think that disabling SSLMODE it's not a big problem.

Other comments

On top of that issues, I think that the proposed docker solution and the docker-compose are not enough similar, and that's the reason why I think that it's better to separate their Readme explanation. In future PRs I will try to reduce these diferences. If you agree with me, of course.

If you agree on merging this PR, the "Launch with Docker" information in https://camptocamp.github.io/terraboard/ will require an update too :)

Again, thanks for your effort!

[coveralls]

Coverage remained the same at 15.541% when pulling c1df224 on uritau:fix/docker-instructions into cec421d on camptocamp:master.

[raphink]

To be fair, I think it's the docker-compose.yml which should be patched instead. We don't maintain oauth2_proxy.

[uritau]

OK! Sorry for my mistake.
What do you think about the new proposal? Deleting the oauth proxy?

[uritau]

I've updated the docker-compose for 4 reasons:

• To remove the oauth2_proxy.
• To Simplify the bootstrap of the project (reducing the number of necessary variables).
• To make it listen to port 8080 instead of 80.
• To avoid ssl issues with postgres.