Provide `pulumi-yaml` image

[EronWright]

Hello!

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Issue details

Pulumi provides language-specific images for all the official Pulumi languages, as an optimized alternative to the "kitchen sink" image. Yet a pulumi/pulumi-yaml image is not provided for pure YAML language programs, forcing the user to use the larger "kitchen sink" image.

This issue also affects the Pulumi Kubernetes Operator, which provides a Program CRD to author YAML-based Pulumi programs. See documentation. It would be nice to have a slim image to use with such programs.

Affected area/feature

[julienp]

pulumi/pulumi-base includes the yaml language plugin and is reasonably slim at 150MB.

[EronWright]

Thanks @julienp, to resolve this issue, I would suggest we update the README.md to mention that pulumi-base contains the YAML runtime. Frankly the name "base" suggests that pulumi-base is the base image for the other images, and one would not expect it to have the yaml runtime.

Perhaps we should consider publishing a pulumi-yaml image for clarity. Or, include the yaml runtime into pulumi-go image.