ci: publish gloas docker image tag

[KaloyanTanev]

Publish obolnetwork/charon:gloas (and ghcr) images on pushes to the gloas branch, mirroring the existing electra tag rule. The gloas branch is excluded from the $APP_VERSION tag so its builds don't overwrite main's version-tagged image. The gloas branch picks the workflow up on its next rebase onto main.

category: misc
ticket: #4324

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

🟢 Approval recommended

The workflow changes correctly mirror the existing electra tagging behavior and cleanly prevent gloas builds from overwriting main’s version-tagged image.

Pull request overview

Updates the Docker image publishing workflow so that pushes to the gloas branch produce a dedicated :gloas image tag (DockerHub + GHCR), aligned with the existing electra branch behavior, while preventing gloas builds from overwriting the version-based ($APP_VERSION) branch tag used by mainline builds.

Changes:

• Add gloas to the workflow’s branch push triggers.
• Publish a gloas Docker tag only when the ref is refs/heads/gloas.
• Exclude the gloas branch from publishing the $APP_VERSION branch tag (like electra).

File summaries

File	Description
.github/workflows/build-push-deploy.yml	Adds gloas branch trigger and tag rules, and prevents gloas builds from publishing the $APP_VERSION branch tag.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.36%. Comparing base (a67667d) to head (f3085ac).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4677      +/-   ##
==========================================
- Coverage   65.40%   65.36%   -0.04%     
==========================================
  Files         247      247              
  Lines       29983    29983              
==========================================
- Hits        19609    19599      -10     
- Misses      10373    10383      +10     
  Partials        1        1              

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