FIX: #6 Add logs folder mount

[sarbesh]

Migrated log_bin and replay-log from /var/log/mysql to /var/lib/mysql as mysql:5.7 doesn't contain the /var/log/mysql folder.

reference: https://stackoverflow.com/questions/26648821/how-can-i-enable-mysql-binary-logging-using-the-official-docker-image

[sarbesh]

@vbabak @renanbenedicto please help verify the changes and approve the PR.

[sarbesh]

Reverted back to original config for logs in the /var/log/mysql folder by adding volume mount as suggested in #6 by @matdurand.

also made some other changes like:

1. Added healthcheck for master and updated client depends on master to be healthy.
2. Updated .gitignore with logs folder

@vbabak @renanbenedicto please help review

[matdurand]

@sarbesh I think you should add the 2 empty "logs" folder, with a .gitkeep file inside to make sure they exists when we checkout and start the docker-compose setup.

[sarbesh]

@vbabak @matdurand the logs folder is auto created when running the build.sh. should we still create logs folder with .gitkeep.

[matdurand]

@sarbesh I don't see anything that creates the log folder in the build.sh file. If they are created when we start docker compose, then it's too late to map them is it not?

[sarbesh]

@matdurand yes I believe the folders are getting created when docker compose is ran, We can still add the logs folder with .gitkeep to be on safe side.

[vbabak]

@sarbesh I would add "logs" folder similar to "data", including ".gitkeep". Could you also update build.sh and add logs cleanup?

[sarbesh]

@vbabak apologies for the delay. Made the changes as requested above. Please review.