chore(ci): add appscan legacy workflow

Author: michaellzc

.github/workflows/appscan-legacy.yml

@@ -0,0 +1,18 @@
+name: static analysis (legacy)
+
+on:
+  push:
+    branches:
+    - master
+    - main
+  workflow_dispatch:
+  repository_dispatch:
+
+jobs:
+  scan:
+    uses: ibm-skills-network/.github/.github/workflows/appscan-legacy.yml@main
+    secrets:
+      skills-network-bot-app-id: ${{ secrets.SKILLS_NETWORK_BOT_APP_ID }}
+      skills-network-bot-private-key: ${{ secrets.SKILLS_NETWORK_BOT_PRIVATE_KEY }}
+      asoc-key: ${{ secrets.ASOC_KEY }}
+      asoc-secret: ${{ secrets.ASOC_SECRET }}