[release-11.6.8] CI: release-build.yml missing pipe (#113919)

CI: release-build.yml missing pipe (#113915)

(cherry picked from commit 92ef1c4942)

Co-authored-by: Kevin Minehart <5140827+kminehart@users.noreply.github.com>

.github/workflows/release-build.yml

@@ -317,7 +317,7 @@ jobs:
           GITHUB_TOKEN: ${{ steps.generate_token.outputs.token }}
           GRAFANA_COMMIT: ${{ needs.setup.outputs.grafana-commit }}
           REPO: ${{ github.repository }}
-        run:
+        run: |
           set -eo pipefail
           gh api "/repos/${REPO}/commits/${GRAFANA_COMMIT}/pulls" | jq -r '.[0].number' | tee issue_number.txt
           echo "ISSUE_NUMBER=$(cat issue_number.txt)" >> "$GITHUB_ENV"