Add addon validation action on push/pr

.github/dependabot.yml

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+# Set update schedule for GitHub Actions
+# https://docs.github.com/fr/code-security/dependabot/working-with-dependabot/keeping-your-actions-up-to-date-with-dependabot
+version: 2
+updates:
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      # Check for updates to GitHub Actions every week
+      interval: "weekly"

.github/workflows/addon-validation.yml

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+# https://github.com/xbmc/action-kodi-addon-checker?tab=readme-ov-file#example-usage
+name: Addon Validation
+
+on: [push, pull_request]
+
+jobs:
+  kodi-addon-checker:
+    name: Kodi Addon checker
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Validate Addon
+        uses: xbmc/[email protected]
+        with:
+          kodi-version: nexus
+          addon-id: ${{ github.event.repository.name }}
+          is-pr: false