Create secondary-workflow.yml

Signed-off-by: Johannes Demer <48685701+jtdemer@users.noreply.github.com>

.github/workflows/secondary-workflow.yml

@@ -0,0 +1,18 @@
+name: Secondary workflow
+
+on:
+  workflow_dispatch:
+
+jobs:
+  add-to-project:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+        with:
+          token: ${{ secrets.ADD_TO_PROJECT_PAT }}
+      - name: Add to project
+        uses: actions/add-to-project@v0.5.0
+        with:
+          project-url: https://github.com/orgs/openMSL/projects/1
+          github-token: ${{ secrets.ADD_TO_PROJECT_PAT }}