Add `pullPolicy` to the run.container task definition

[mrsimonemms]

What would you like to be added?

The run.container task should have a pullPolicy to decide how to handle downloading images as part of the run process.

This should accept the following values:

• ifNotPresent. This is the default and would only pull the image if not already on the running machine
• always. This would always pull the image, even if it already exists
• never. This would never pull the image

(Yes, these are the same values as Kubernetes. But it works).

Discussed in #1137 (comment)

Proposal(s):

No response

Alternative(s):

Metadata on an implementation-specific point of view. This becomes potentially messy though.

Additional info:

I'm happy to do a PR for the spec and the Go SDK.

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[mrsimonemms]

Happy to do the PR for the spec and the Go SDK