Add GitHub Action to publish Docker images to GHCR

[Copilot]

Adds CI/CD workflow to build and publish Docker images to GitHub Container Registry for easy deployment.

Changes

• New workflow .github/workflows/publish-ghcr.yml:
  • Triggers on push to main/develop branches and version tags (v*)
  • PR builds validate Dockerfile without pushing
  • Auto-generates tags from branch, semver, and SHA
  • Uses GHA cache for layer caching
  • Authenticates via GITHUB_TOKEN (no additional secrets needed)

Tagging Strategy

Event	Example Tags
Push to develop	develop, sha-abc1234
Push to main	main, sha-abc1234
Tag v1.2.3	1.2.3, 1.2, sha-abc1234

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com//advisories
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add Github Action to Publish to GHCR</issue_title>
<issue_description>The docker needs to be published for easy deployment.

Use git flow branching schema, and make PR from feature/ branch to develop.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add Github Action to Publish to GHCR #1

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