trigger workflow for external CI

Author: MatthiasBSchaefer

.github/workflows/triggerCI.yml

@@ -0,0 +1,24 @@
+name: Sync_CI_Repo
+
+on: pull_request_target
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+
+steps:
+  - uses: actions/github-script@v7
+    with:
+      github-token: ${{ secrets.GITHUB_TOKEN }}
+      script: |
+        const pr = context.payload.pull_request || {};
+        await github.rest.repos.createDispatchEvent({
+          owner: 'ltx-simulation',
+          repo: 'ModelicaStandardLibrary',
+          event_type: 'CI_trigger_type',
+          client_payload: {
+            number: context.payload.number,
+            head_sha: pr.head?.sha ?? null,
+            base_sha: pr.base?.sha ?? null,
+          }
+        });