[FLINK-33916][ci] Adds workflow trigger

.github/workflows/nightly-trigger.yml

@@ -0,0 +1,45 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This workflow is meant as an extended CI run that includes certain features that shall be tested
+# and JDK versions that are supported but not considered default.
+
+name: "Nightly trigger (beta)"
+
+on:
+  schedule:
+    - cron: '0 2 * * *'
+
+jobs:
+  Trigger:
+    permissions:
+      actions: write
+    strategy:
+      matrix:
+        branch:
+          - master
+          - release-1.18
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger Workflow
+        uses: actions/github-script@v7
+        with:
+          script: |
+            github.rest.actions.createWorkflowDispatch({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              workflow_id: 'nightly.yml',
+              ref: '${{ matrix.branch }}'
+            })

.github/workflows/nightly.yml

@@ -19,8 +19,6 @@
 name: "Nightly (beta)"
 
 on:
-  schedule:
-    - cron: '0 2 * * *'
   workflow_dispatch:
 
 permissions: read-all