Dynamic tagging support

[ugurkany]

This PR adds support for custom tagging on the task definition level. Also, you can define dynamic tags that are specific to builds.

Relevant PR: https://github.com/jenkinsci/amazon-ecs-plugin/pull/272

The main difference with the PR above is you can define specific tags to task definitions via Jenkins GUI on this PR.

Resolves following issues: https://github.com/jenkinsci/amazon-ecs-plugin/issues/256 https://github.com/jenkinsci/amazon-ecs-plugin/issues/261

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[Stericson]

@ugurkany Would you mind resolving the conflicts here?

[ugurkany]

@Stericson Sorry for the late response. These conflicts cause by merging the other PR. The other PR had a few missing points like defining tags with GUI or via declarative Pipeline. I didn't test it, but as far as I see on the code, it overrides the tags already defined on AWS manually. I hope that won't be an issue in some cases. And without propagation, how will AWS tasks collect tags from task definition? Users need to configure this manually after the creation of the task definition. I prefer to merge this if I were in your shoes. So solving conflicts won't be enough. I need to recode the extra things that I developed.

[Stericson]

@ugurkany I see your points. I'll take a look at this more in depth on Monday.

[Stericson]

@ugurkany Merged 👍

[charbl]

question, if I wanted the tag to contain the env var JOB_NAME (the active job) ... how would i setup the task def to contain this and pull that info when the job is run?