Add configurable login parameters

[Nibooor]

Hi,

similar to the issue #77 and PR #104 I think that not having the option to use images from a private (i.e. login-protected) registry is quite a limitation. I tried a different, simpler approach than #104, that consists in maintaining the login information at the container job and adding a docker login and docker pull to the ctl before starting the container.

What do the maintainers think about this approach? I gathered that there are more people trying to do this.

Change:

Add configurable login parameters to pull images from custom (private) docker registries where authentication is needed.

• Add properties login.name, login.password, login.server to container job and create environment variable for login parameters from these properties
• Add docker login and docker pull commands to job ctl that is executed if the login properties are set

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Stale pull request message

[thoHeinze]

@neil-hickey Any chance somebody could do a code review for this change? I see you recently merged some PRs, maybe you can help to identify somebody to look into this.