refactor(ci): organize workflow scripts and gate publish on main

scripts/github/publish-containers/checkout-workflow-run-commit.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+WORKFLOW_RUN_SHA="${WORKFLOW_RUN_SHA:?WORKFLOW_RUN_SHA must be set}"
+
+git checkout -f "${WORKFLOW_RUN_SHA}"
+git fetch --tags --force
+git tag --list 'stable' 'v*' --sort=version:refname | tail -n 20

scripts/github/publish-containers/compute-publish-container-info.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SHA="$(git rev-parse HEAD)"
+
+V_TAG="$(git tag --points-at "${SHA}" --list 'v*' | sort -V | tail -n1)"
+if [[ -z "${V_TAG}" ]]; then
+  echo "No version tag found for ${SHA}. Skipping publish."
+  echo "should_publish=false" >> "$GITHUB_OUTPUT"
+  exit 0
+fi
+
+VERSION="${V_TAG#v}"
+
+STABLE_SHA="$(git rev-parse -q --verify 'refs/tags/stable^{commit}' 2>/dev/null || true)"
+IS_STABLE=false
+[[ -n "${STABLE_SHA}" && "${STABLE_SHA}" == "${SHA}" ]] && IS_STABLE=true
+
+{
+  echo "should_publish=true"
+  echo "version=${VERSION}"
+  echo "is_stable=${IS_STABLE}"
+} >> "$GITHUB_OUTPUT"

scripts/github/publish-containers/publish-container-images.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+: "${OWNER:?OWNER must be set}"
+: "${VERSION:?VERSION must be set}"
+: "${IS_STABLE:?IS_STABLE must be set}"
+
+bash scripts/build/publish.sh