test(ci): cover Helm chart version mapping (#2751)

scripts/helm_chart_version.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [ "$#" -ne 1 ]; then
+  echo "usage: $0 <tag-or-ref>" >&2
+  exit 2
+fi
+
+RAW="$1"
+case "$RAW" in
+  refs/tags/*)
+    RAW_TAG="${RAW#refs/tags/}"
+    ;;
+  *)
+    RAW_TAG="$RAW"
+    ;;
+esac
+
+APP_VERSION="${RAW_TAG#v}"
+BETA_NUM=$(printf '%s\n' "$APP_VERSION" | sed -n -E 's/^.*-beta\.([0-9]+)$/\1/p')
+if [ -n "$BETA_NUM" ]; then
+  CHART_VERSION="0.${BETA_NUM}.0"
+else
+  CHART_VERSION="$APP_VERSION"
+fi
+
+if [ -n "${GITHUB_OUTPUT:-}" ]; then
+  {
+    echo "raw_tag=$RAW_TAG"
+    echo "app_version=$APP_VERSION"
+    echo "chart_version=$CHART_VERSION"
+  } >>"$GITHUB_OUTPUT"
+else
+  printf 'raw_tag=%s\n' "$RAW_TAG"
+  printf 'app_version=%s\n' "$APP_VERSION"
+  printf 'chart_version=%s\n' "$CHART_VERSION"
+fi