Update the Gateway image in staging

[mkysel]

Pass the staging Gateway image to Terraform by adding the xmtpd_gateway_docker_image variable in the GitHub Actions workflow at build-xmtpd.yml to update the Gateway image in staging

The GitHub Actions workflow updates the Terraform variable payload to include a third variable, xmtpd_gateway_docker_image, whose value is set from steps.digests.outputs.gateway_image. This change occurs in build-xmtpd.yml within the step that assembles and passes variables to Terraform Cloud.

📍Where to Start

Start with the workflow step that constructs Terraform variable lists in build-xmtpd.yml, focusing on where xmtpd_gateway_docker_image is added and populated from steps.digests.outputs.gateway_image.

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Macroscope summarized 80639d5.

[graphite-app]

How to use the Graphite Merge Queue

Add either label to this PR to merge it via the merge queue:

• Queue - adds this PR to the back of the merge queue
• Hotfix - for urgent hot fixes, skip the queue and merge this PR next

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An organization admin has enabled the Graphite Merge Queue in this repository.

Please do not merge from GitHub as this will restart CI on PRs being processed by the merge queue.