Fixes docker scripts for demo to work properly

[mdjunior]

Context

The demo using docker-compose needs tweaking to work properly. This PR addresses current issues by providing a solution to using the demo.

Steps to use demo

To start the demo, you need create a builded versions after clonning repo:

make release

After it, we can run the demo:

cd docker
make install

To configure gsh-client:

../dist/darwin/amd64/gsh target-add local http://localhost:8000 -s

Now, you need crate a user with email admin@example.com. Please, check that we are using macOS keychain to store credentials.

../dist/darwin/amd64/gsh login -s keychain

Configure a role to allow the ssh access to docker with gsh-agent (attention, this is a very permissive role):

../dist/darwin/amd64/gsh role-add docker -s 172.16.0.0/12 -d 172.16.0.0/12 -u root
../dist/darwin/amd64/gsh role-assign docker admin@example.com

Check the gsh-agent docker IP using docker inspect gsh_target_machine. After that, change the IPs in the following command to get the SSH call to connect to the target docker.

../dist/darwin/amd64/gsh h -d -u root -p 22000 -s 172.23.0.1 172.23.0.5   

The command will look like:

ssh -i /Users/manoel.junior/.gsh/certs/local/RDaaz8s9z4oU5r2Iocqy4W1SSkBPeq9l -i /Users/manoel.junior/.gsh/certs/local/RDaaz8s9z4oU5r2Iocqy4W1SSkBPeq9l-cert.pub -l root -p 22000 172.20.0.5

Remove the destination IP at the end and put it as localhost since docker is forwarding the port to your computer.

ssh -i /Users/manoel.junior/.gsh/certs/local/RDaaz8s9z4oU5r2Iocqy4W1SSkBPeq9l -i /Users/manoel.junior/.gsh/certs/local/RDaaz8s9z4oU5r2Iocqy4W1SSkBPeq9l-cert.pub -l root -p 22000 localhost