Adding installation of skopeo

.github/workflows/test.yml

@@ -1,6 +1,7 @@
 name: Test Action
 
 on:
+  workflow_dispatch:
   push:
     branches:
       - master
@@ -54,6 +55,9 @@ jobs:
         uses: actions/checkout@v4
       - name: Clone repo
         run: git clone --depth=1 ${{matrix.repo}} -b ${{matrix.ref}} ${{matrix.package}}
+      - name: Prepare environment for action-debian-package
+        run: |
+          which skopeo || (apt update; apt -y install skopeo)
       - name: Test run
         uses: ./
         with: