try to get repo by env

.gitea/workflows/renovate.yml

@@ -16,9 +16,6 @@ jobs:
       - name: Checkout
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # 4.1.1
 
-      - name: Prepare renovate
-        run: echo ::set-env name=RENOVATE_REPOSITORIES::["${{ env.GITHUB_REPOSITORY }}"]
-
       - name: Renovate
         run: renovate
         env:
@@ -26,4 +23,4 @@ jobs:
           RENOVATE_CONFIG_FILE: "${{ github.workspace }}/renovate.json"
           RENOVATE_ENDPOINT: https://git.keine.cloud/api/v1
           RENOVATE_TOKEN: ${{ secrets.RENOVATE_TOKEN }}
-          RENOVATE_REPOSITORIES: ${{ env.RENOVATE_REPOSITORIES }}
+          RENOVATE_REPOSITORIES: ${{ format('["{0}"]', env.GITHUB_REPOSITORY) }}