try to get repo by env

.gitea/workflows/renovate.yml

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