Check before downloading gem

[wildmaples]

Wait for rubygems to make new version available before running docker push.

Got a successful push: https://hub.docker.com/layers/gusto/buildkite-builder/4.18.0/images/sha256-e65226fd370c7a60b14b195d5c1ba494cf1a341a2bec18bf53ac2aab03915bf8

[noizwaves]

@wildmaples this implementation is a bit unexpected. I'm wondering if there's a way for the image build step itself to block on the gem publish. Do you know where the gem publishing is happening?

If it's manual, we could extract this logic to a dedicated step, so it doesn't live inside the Dockerfile.

[ngan]

Move ARG before COPY. Change to:

RUN /tmp/boostrap && rm -f /tmp/bootstrap

[wildmaples]

@wildmaples this implementation is a bit unexpected. I'm wondering if there's a way for the image build step itself to block on the gem publish. Do you know where the gem publishing is happening?

If it's manual, we could extract this logic to a dedicated step, so it doesn't live inside the Dockerfile.

The gem publishing is happening in this script. The image build step to block on gem publish was my initial consideration but I opted for the looped retrying so we won't have to take the action to unblock twice in order to publish.