feat: get token for olcs-etl checkout from new github app

.github/workflows/run-liquibase.yaml

@@ -69,12 +69,22 @@ jobs:
         with:
           ref: ${{ inputs.ref || github.event.inputs.ref }}
 
+      - name: Generate GitHub App Token
+        id: generate-token
+        uses: actions/create-github-app-token@v1
+        with:
+          app-id: ${{ vars.VOL_GITHUB_APP_ID }}
+          private-key: ${{ secrets.VOL_GITHUB_APP_PRIVATE_KEY }}
+          owner: dvsa
+          repositories: olcs-etl
+
       - name: Checkout ETL repository
         uses: actions/checkout@v4
         with:
           repository: dvsa/olcs-etl
           path: infra/docker/liquibase/changelog
           ref: ${{ inputs.etl_ref || 'main' }}
+          token: ${{ steps.generate-token.outputs.token }}
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3