Trigger cmsis-toolbox nightly after finishing devtools nightly (#2471)

## Changes

- Trigger the CMSIS-Toolbox nightly workflow after the DevTools nightly
completes.
- The CMSIS-Toolbox nightly runs only when:
   - It's scheduled cron job triggers it, or
- The DevTools workflow is manually executed with `build_toolbox=true`.
  
## Checklist
<!-- Put an `x` in the boxes. All tasks must be completed and boxes
checked before merging. -->
- [x] 🤖 This change is covered by unit tests (if applicable).
- [x] 🤹 Manual testing has been performed (if necessary).
- [x] 🛡️ Security impacts have been considered (if relevant).
- [x] 📖 Documentation updates are complete (if required).
- [x] 🧠 Third-party dependencies and TPIP updated (if required).

Author: soumeh01

.github/workflows/nightly.yml

@@ -2,6 +2,12 @@ name: nightly
 
 on:
   workflow_dispatch:
+    inputs:
+      trigger_toolbox_build:
+        description: 'Trigger cmsis-toolbox build as a part of this workflow'
+        required: false
+        default: false
+        type: boolean
   schedule:
     - cron: '0 0 * * *'
 
@@ -111,3 +117,21 @@ jobs:
           commit: ${{ github.sha }}
           report_individual_runs: true
           files: "artifacts/**/*.xml"
+
+  # Triggers the cmsis-toolbox nightly workflow in the separate repository
+  trigger-toolbox-nightly:
+    needs: [ publish-test-results, coverage ]
+    if: >-
+      success() &&
+      github.repository == 'Open-CMSIS-Pack/devtools' &&
+      (github.event_name == 'schedule' || github.event.inputs.trigger_toolbox_build)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger cmsis-toolbox Nightly
+        run: |
+          curl --fail-with-body --show-error --silent -X POST \
+            -H "Authorization: Bearer ${{ secrets.CROSS_REPO_TOOLBOX_TOKEN }}" \
+            -H "Accept: application/vnd.github+json" \
+            -H "Content-Type: application/json" \
+            https://api.github.com/repos/Open-CMSIS-Pack/cmsis-toolbox/actions/workflows/nightly.yml/dispatches \
+            -d '{"ref":"main","inputs":{"trigger_extension_build":"true","use_nightly_devtools":"${{ github.event_name == 'schedule' && 'true' || 'false' }}"}}'