chore: replace Black Duck scan workflow with a trigger workflow (#1385)

On-behalf-of: Gerald Morrison (SAP) <gerald.morrison@sap.com>
Signed-off-by: Gerald Morrison (SAP) <gerald.morrison@sap.com>

<!-- markdownlint-disable MD041 -->
#### What this PR does / why we need it
Change the current repo-based workflow to a reusable workflow trigger.

---------

Signed-off-by: Gerald Morrison (SAP) <gerald.morrison@sap.com>
Co-authored-by: Gerald Morrison (SAP) <gerald.morrison@sap.com>

Author: morri-son

.github/workflows/blackduck_scan.yaml

@@ -0,0 +1,24 @@
+# Trigger central Black Duck scan workflow for the Open Component Model project.
+name: Trigger Blackduck Scan
+on: 
+  push:
+    paths-ignore:
+    - '.github/workflows/**'
+    branches: [ "main" ]
+  pull_request_target:
+    paths-ignore:
+    - '.github/workflows/**'
+    branches: [ "main" ]
+  schedule:
+    - cron:  '25 0 * * 0'
+  workflow_dispatch:
+
+jobs:
+  trigger-scan:
+    uses: open-component-model/.github/.github/workflows/blackduck-scan.yaml@47e68e42a6d78125d519e6e008c2b203385a0a72
+    with:
+      # required to be able to differentiate between PRs and pushes in the called workflow (rapid or full scan)
+      event_type: ${{ github.event_name }}
+    secrets: inherit
+    permissions:
+      contents: read