Render a list of GitHub deployments as a Slack message

Render a list of GitHub deployments as a Slack message: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). We want to show a repository's GitHub deployments inside Slack. The data comes from GitHub's GraphQL API as an array of deployment nodes, each shaped like: