fix: allow for alpha and beta releases in addition to stable

This adds alpha and beta releases, which are already supported for syncing to cvmfs.

.gitlab-ci.yml

@@ -107,10 +107,10 @@ version:
       elif [[ "$CI_COMMIT_TAG" =~ ^v[0-9.]+\.[0-9]+\.[0-9]+ ]]; then
         VERSION="${CI_COMMIT_TAG:1}"
         EXPORT_TAG="${VERSION}"
-      elif [[ "$CI_COMMIT_BRANCH" =~ ^v[0-9.]+\.[0-9]+-(alpha|beta|stable) ]]; then
+      elif [[ "$CI_COMMIT_BRANCH" =~ ^v[0-9.]+\.[0-9]+-\(alpha\|beta\|stable\) ]]; then
         VERSION="${CI_COMMIT_BRANCH:1}"
         EXPORT_TAG="${VERSION}"
-      elif [[ "$CI_COMMIT_BRANCH" =~ ^v[0-9.]+\.[0-9]+-[a-z]+-(alpha|beta|stable) ]]; then
+      elif [[ "$CI_COMMIT_BRANCH" =~ ^v[0-9.]+\.[0-9]+-[a-z]+-\(alpha\|beta\|stable\) ]]; then
         VERSION="${CI_COMMIT_BRANCH:1}"
         EXPORT_TAG="${VERSION}"
       elif [[ "$CI_COMMIT_BRANCH" =~ ^master$ ]]; then