Create separate night trigger workflow for 24.lts.1+ (#469)

This allows us to stagger on-device tests to mitigate
running into capacity issues.

b/284305504

.github/workflows/nightly_trigger.yaml

@@ -7,27 +7,6 @@ on:
   workflow_dispatch:
 
 jobs:
-  trigger_24:
-    permissions:
-      actions: write
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: kaidokert/[email protected]
-        with:
-          fetch-depth: 1
-          ref: 24.lts.1+
-          persist-credentials: false
-      - name: Trigger Nightly
-        run: |
-          set -x
-          gh workflow run android_24.lts.1+ --ref 24.lts.1+ -f nightly=true
-          gh workflow run evergreen_24.lts.1+ --ref 24.lts.1+ -f nightly=true
-          gh workflow run linux_24.lts.1+ --ref 24.lts.1+ -f nightly=true
-          gh workflow run raspi-2_24.lts.1+ --ref 24.lts.1+ -f nightly=true
-          gh workflow run win32_24.lts.1+ --ref 24.lts.1+ -f nightly=true
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
   trigger_23:
     permissions:
       actions: write

.github/workflows/nightly_trigger_24.lts.1+.yaml

@@ -0,0 +1,30 @@
+name: nightly_trigger_24.lts.1+
+
+on:
+  schedule:
+    # GMT timezone.
+    - cron: '30 5 * * *'
+  workflow_dispatch:
+
+jobs:
+  trigger_24:
+    permissions:
+      actions: write
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: kaidokert/[email protected]
+        with:
+          fetch-depth: 1
+          ref: 24.lts.1+
+          persist-credentials: false
+      - name: Trigger Nightly
+        run: |
+          set -x
+          gh workflow run android_24.lts.1+ --ref 24.lts.1+ -f nightly=true
+          gh workflow run evergreen_24.lts.1+ --ref 24.lts.1+ -f nightly=true
+          gh workflow run linux_24.lts.1+ --ref 24.lts.1+ -f nightly=true
+          gh workflow run raspi-2_24.lts.1+ --ref 24.lts.1+ -f nightly=true
+          gh workflow run win32_24.lts.1+ --ref 24.lts.1+ -f nightly=true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}