if tag exists return tag

.github/actions/bump-version/action.yaml

@@ -38,6 +38,13 @@ runs:
       id: bump
       shell: bash
       run: |
+        EXISTING_TAG="$(git tag --points-at HEAD "v*" | head -n 1)"
+        if [ -n "${EXISTING_TAG}" ]; then
+          echo "Tag ${EXISTING_TAG} already points at this commit; skipping bump."
+          echo "tag=${EXISTING_TAG}" >> "${GITHUB_OUTPUT}"
+          exit 0
+        fi
+
         REF="${GITHUB_REF:-${GITEA_REF}}"
         BRANCH="${REF#refs/heads/}"
         git fetch origin "${BRANCH}" --tags