Add workflow for deleting packages (#244)

Signed-off-by: Xudong Sun <[email protected]>

.github/workflows/delete-pkg.yml

@@ -0,0 +1,19 @@
+on:
+  workflow_dispatch:
+    inputs:
+      image:
+        description: 'Name of the image to be deleted'
+        required: true
+        type: string
+jobs:
+  use_api:
+    runs-on: ubuntu-20.04
+    permissions:
+        contents: read
+        packages: write
+    steps:
+      - name: Delete packages
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+            gh api --method DELETE -H "Accept: application/vnd.github+json" -H "X-GitHub-Api-Version: 2022-11-28" /orgs/vmware-research/packages/container/verifiable-controllers%2F${{ inputs.image }}