feat: Add Differ integration

.github/gen_package_list.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+
+packages=""
+IFS='
+'
+for line in $(dpkg -l --no-pager); do
+    case "$line" in
+        "ii"*)
+            items=$(echo "$line" | sed -E "s/\\s+/ /g")
+            name=$(echo "$items" | cut -d ' ' -f2 | cut -d ':' -f1)
+            version=$(echo "$items" | cut -d ' ' -f3)
+            packages="$packages{\"name\":\"$name\",\"version\":\"$version\"},"
+            ;;
+    esac
+done
+
+packages="[${packages%,}]"
+printf "\"packages\":%s\n" "$packages"

.github/workflows/differ.yml

@@ -0,0 +1,30 @@
+name: Differ
+
+on:
+  workflow_run:
+    workflows: [Vib Build]
+    types:
+      - completed
+
+jobs:
+  differ:
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/vanilla-os/desktop:main
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Generate package diff
+        run: |
+          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 ${{ secrets.GITHUB_TOKEN }}" \
+          -H "X-GitHub-Api-Version: 2022-11-28" \
+          https://api.github.com/orgs/Vanilla-OS/packages/container/desktop/versions | grep -m1 name | sed -E 's/^\s*"name": "(.+)".*$/\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/desktop/new