feat(ci): add Slack deployment notification to production pipeline

[yodem]

Description

Adds a Slack notification step to the production deployment pipeline. On successful production deploy, a message is sent to Slack with the deployed version, chart version, and a changelog of commits since the previous tag.

Code Changes

.github/workflows/production-deploy.yaml

• Checkout step (prod-deploy job): Set fetch-depth: 0 so the full git history and tags are available for changelog generation.
• New step – Send Slack deployment notification: Added after the "Update workflow default chart" step:
  • Uses secrets.QA_SLACK_WEBHOOK_URL for the Slack Incoming Webhook.
  • Skips execution when the webhook URL is unset.
  • Uses continue-on-error: true so notification failures do not fail the workflow.
  • Builds changelog from git log (commits since the previous tag, up to 15, or last 10 commits if there is no previous tag).
  • Sends a message with version, chart version, and a bulleted list of commits (subject + short hash).
  • Uses jq -Rs '{text: .}' to build the JSON payload and curl to POST to Slack.

Notes

• SC-42024: Implements the Slack deployment announcement feature.
• No-op behavior: If the webhook URL is missing or the step fails (e.g. network, invalid URL), the workflow still succeeds.
• Reused secret: Uses the existing QA_SLACK_WEBHOOK_URL secret; no new secret is required.
• Checkout impact: fetch-depth: 0 increases checkout size and time slightly for the prod-deploy job.

[mergify]

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