Haroon Chaudhry

[FR] Make builders available via Artifact Registry

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## Make builders available via Artifact Registry At the moment cloud builders are only available via [Container Registry](https://cloud.google.com/container-registry). Given that [Artifact Registry](https://cloud.google.com/artifact-registry) is the suggested registry for GCP, builder images...

Added support to push all supported builders to AR

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Added support to push all supported builders to AR resolves #844

"It would be neat if images built by GCB could populate OCI annotation keys as labels https://github.com/opencontainers/image-spec/blob/main/annotations.md#pre-defined-annotation-keys " @kmontg

Reusing Params substitution in StepActions does not always work

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# Expected Behavior Assuming StepAction has two Params, `param1` and `param2`, when a Param2 uses value of `$(params.param1)` as default value, we expect it to be substituted with the value...