Trigger schedule(nightly) builds on non default branches

Signed-off-by: Pedro Algarvio <palgarvio@vmware.com>

.github/workflows/nightly.yml

@@ -4,6 +4,7 @@
 name: Nightly
 
 on:
+  workflow_dispatch: {}
   schedule:
     # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#onschedule
     - cron: '0 3 * * *'  # Every day at 3AM
@@ -16,6 +17,7 @@ env:
 permissions:
   contents: read  # for dorny/paths-filter to fetch a list of changed files
   pull-requests: read  # for dorny/paths-filter to read pull requests
+  actions: write  # to trigger branch nightly builds
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event_name }}-${{ github.repository }}-${{ github.head_ref || github.run_id }}
@@ -23,6 +25,17 @@ concurrency:
 
 jobs:
 
+  trigger-branch-nightly-builds:
+    name: Trigger Branch Schedule Workflows
+    if: ${{ github.event_name == 'schedule' }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger 3006.x branch
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh workflow run nightly.yml --repo ${{ github.repository }} --ref 3006.x
+
   prepare-workflow:
     name: Prepare Workflow Run
     runs-on: ubuntu-latest
@@ -1732,6 +1745,7 @@ jobs:
     if: always()
     runs-on: ubuntu-latest
     needs:
+      - trigger-branch-nightly-builds
       - prepare-workflow
       - pre-commit
       - lint

.github/workflows/templates/nightly.yml.jinja

@@ -4,6 +4,7 @@
 <%- block on %>
 
 on:
+  workflow_dispatch: {}
   schedule:
     # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#onschedule
     - cron: '0 3 * * *'  # Every day at 3AM
@@ -18,6 +19,34 @@ concurrency:
 
 <%- endblock concurrency %>
 
+<%- block permissions %>
+<{- super() }>
+<%- if workflow_slug == "nightly" %>
+  actions: write  # to trigger branch nightly builds
+<%- endif %>
+<%- endblock permissions %>
+
+<%- block pre_jobs %>
+
+  <%- set job_name = "trigger-branch-nightly-builds" %>
+  <%- set branches = ["3006.x"] %>
+
+  <{ job_name }>:
+  <%- do conclusion_needs.append(job_name) %>
+    name: Trigger Branch Schedule Workflows
+    if: ${{ github.event_name == 'schedule' }}
+    runs-on: ubuntu-latest
+    steps:
+    <%- for branch in branches %>
+      - name: Trigger <{ branch }> branch
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh workflow run <{ gh_environment }>.yml --repo ${{ github.repository }} --ref <{ branch }>
+    <%- endfor %>
+
+<%- endblock pre_jobs %>
+
 <%- block jobs %>
   <{- super() }>