fu/ci: convert differ to job under vib-build

Signed-off-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

.github/workflows/vib-build.yml

@@ -113,3 +113,29 @@ jobs:
         subject-name: ${{ env.IMAGE_URL }}
         subject-digest: ${{ steps.push.outputs.digest }}
         push-to-registry: false
+
+  differ:
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/vanilla-os/nvidia:main
+    if: github.repository == 'vanilla-os/nvidia-image' && github.ref_type == 'tag'
+    needs: build
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Generate package diff
+        run: |
+          lpkg --unlock
+          PACKAGE_LIST=$(.github/gen_package_list.sh)
+          apt-get install -y curl
+          IMAGE_DIGEST=$(curl -s -L -H "Accept: application/vnd.github+json" \
+          -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
+          -H "X-GitHub-Api-Version: 2022-11-28" \
+          https://api.github.com/orgs/Vanilla-OS/packages/container/nvidia/versions | grep -m1 name | sed -E 's/^\s*"name": "(.+)".*$/\1/')
+          curl -X POST \
+          -H 'Accept:application/json' \
+          -H "Authorization:Basic $(echo -n "${{ secrets.DIFFER_USER }}:${{ secrets.DIFFER_PSW }}" | base64)" \
+          -d "{\"digest\":\"${IMAGE_DIGEST}\",${PACKAGE_LIST}}" \
+          ${{ vars.DIFFER_URL }}/images/nvidia/new
+          lpkg --lock