.github/workflows/add-label-when-promoted.yaml: add missing run com…

…mand

In #572 `run: echo
"$GITHUB_CONTEXT"` line removed by mistake causing the workflow to fail

Adding it back

(cherry picked from commit c0a77c3)

.github/workflows/add-label-when-promoted.yaml

@@ -22,6 +22,7 @@ jobs:
       - name: Dump GitHub context
         env:
           GITHUB_CONTEXT: ${{ toJson(github) }}
+        run: echo "$GITHUB_CONTEXT"
       - name: Checkout repository
         uses: actions/checkout@v4
         with: