Port refactors to publish-containers.yml from main to 3.21

[stmpn]

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[changeset-bot]

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Latest commit: 9cd162e

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[stmpn]

Part of https://linear.app/saleor/issue/ENG-1161/refactor-workflows-in-saleor-dashboard-so-they-use-reusable-slack and also https://linear.app/saleor/issue/ENG-1259/every-new-dashboard-and-core-image-is-tagged-as-latest

[Copilot]

Pull request overview

Ports the container publishing workflow to the refactored structure from main, centralizing image metadata computation and delegating multi-arch build/push to a reusable workflow, with added failure notifications.

Changes:

• Split workflow into prepare-variables + reusable build-push job and a summary job.
• Add conditional latest tagging logic and pass computed tags/labels/version into the build job.
• Add failure-only secret loading (1Password) and Slack notification via reusable workflow.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.91%. Comparing base (1a45498) to head (9cd162e).
⚠️ Report is 1 commits behind head on 3.21.

Additional details and impacted files

@@           Coverage Diff            @@
##             3.21    #6329    +/-   ##
========================================
  Coverage   64.91%   64.91%            
========================================
  Files        1447     1447            
  Lines       25149    25149            
  Branches     5134     4955   -179     
========================================
  Hits        16326    16326            
  Misses       8779     8779            
  Partials       44       44            

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.