Allow users to set multiple tags with the buildpacks task

[dfreilich]

Expected Behavior

With #415, the buildpacks task will be updated to use the creator binary. That allows users to add additional tags to the image by passing though -tag <TAG>. I would expect you to be able to pass TAGS to the buildpacks task, and it would work.

Actual Behavior

It doesn't work.

Additional Info

I spiked in working on this, but I found it non-trivial. Doing it in a good fashion (allowing users to say TAG: latest this-tag use-this-image) proves a bit difficult, because every one of those needs to be prefaced with -tag=), and when I tried to use it as an input to the create step, it gave me grief because it read it as an additional parameter to the task, instead of an argument.

We may want to look into using https://github.com/tektoncd/pipeline/blob/master/docs/tasks.md#emitting-results to properly convert the input string into one we can use as an arg to the task, though that would necessitate converting it from a Task to a Pipeline. See tektoncd/pipeline#1950 and tektoncd/pipeline#1978 for more details.

[tekton-robot]

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[tekton-robot]

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[tekton-robot]

@tekton-robot: Closing this issue.

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[vdemeester]

/remove-lifecycle rotten
/remove-lifecycle stale
/reopen

[tekton-robot]

@vdemeester: Reopened this issue.

In response to this:

/remove-lifecycle rotten
/remove-lifecycle stale
/reopen

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[tekton-robot]

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[dfreilich]

/remove-lifecycle rotten

[vdemeester]

/remove-lifecycle stale

[tekton-robot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale with a justification.
Stale issues rot after an additional 30d of inactivity and eventually close.
If this issue is safe to close now please do so with /close with a justification.
If this issue should be exempted, mark the issue as frozen with /lifecycle frozen with a justification.

/lifecycle stale

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[tekton-robot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten with a justification.
Rotten issues close after an additional 30d of inactivity.
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/lifecycle rotten

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[tekton-robot]

Rotten issues close after 30d of inactivity.
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/close

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[tekton-robot]

@tekton-robot: Closing this issue.

In response to this:

Rotten issues close after 30d of inactivity.
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