[Copilot]

Snapshot builds currently publish a global SNAPSHOT tag regardless of source branch, which allows release-branch builds to overwrite the canonical development snapshot. This change scopes global SNAPSHOT publication to main while preserving versioned snapshot tags for all snapshot builds.

• Tagging logic in release publishing

  • Updated release.sh to always publish ${VERSION}-SNAPSHOT for snapshot builds.
  • Added branch-aware gating so plain SNAPSHOT is only appended when the effective branch is main.

• Workflow branch source propagation

  • Updated publish job env in build-test-and-publish.yml to pass SNAPSHOT_TAG_BRANCH from:
    • github.event.release.target_commitish (release-triggered workflows), or
    • github.ref_name (fallback for other triggers).

• Focused regression coverage

  • Added test/test-release-tags.sh to assert:
    • main snapshot builds include both ${VERSION}-SNAPSHOT and SNAPSHOT
    • release-branch snapshot builds include ${VERSION}-SNAPSHOT but not SNAPSHOT

if [ "${SNAPSHOT}" = "true" ]; then
  tags+=("${VERSION}-SNAPSHOT")
  SNAPSHOT_TAG_BRANCH="${SNAPSHOT_TAG_BRANCH:-${GITHUB_REF_NAME:-}}"
  if [ "${SNAPSHOT_TAG_BRANCH}" = "main" ]; then
    tags+=("SNAPSHOT")
  fi
fi

[Copilot]

Pull request overview

This PR prevents non-main snapshot builds from overwriting the canonical global SNAPSHOT Docker tag by only publishing SNAPSHOT when the effective source branch is main, while still publishing ${VERSION}-SNAPSHOT for all snapshot builds.

Changes:

• Update release.sh snapshot tagging to always emit ${VERSION}-SNAPSHOT, and only add the plain SNAPSHOT tag when SNAPSHOT_TAG_BRANCH resolves to main.
• Propagate SNAPSHOT_TAG_BRANCH into the publish job from github.event.release.target_commitish (release event) or github.ref_name (fallback).
• Add a regression test script intended to validate tag behavior for main vs. release branches.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
test/test-release-tags.sh	Adds a mock-docker regression test for snapshot tag selection by branch.
release.sh	Gates publication of the global SNAPSHOT tag to main while keeping versioned snapshot tags.
.github/workflows/build-test-and-publish.yml	Passes SNAPSHOT_TAG_BRANCH to the publish step based on trigger context.

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