add additional renovate config env (#40)

#### 📖 Summary

- add renovate label for pull requests created by renovate
- disable github token warning for self hosted renovate instance

#### 📑 Test Plan

> 💡 Select your test plan for the code changes.

- [x] CI pipeline
- [ ] Custom test
- [ ] No test plan

##### Details / Justification

<!-- Add your test details or justification for missing tests here. -->

#### 📚 Additional Notes

<!-- A place for additional detail notes. -->

Co-authored-by: OCram85 <marco.blessing@googlemail.com>
Reviewed-on: #40

.woodpecker/renovate.yml

@@ -6,13 +6,14 @@ pipeline:
     secrets:
       - RENOVATE_TOKEN
     environment:
-      LOG_LEVEL: debug
+      #LOG_LEVEL: debug
       RENOVATE_PLATFORM: "gitea"
       RENOVATE_ENDPOINT: "https://gitea.ocram85.com"
       RENOVATE_REPOSITORIES: "${CI_REPO}"
       RENOVATE_LABELS: "renovate"
       #RENOVATE_DRY_RUN: "full"
       RENOVATE_TOKEN: "${RENOVATE_TOKEN}"
+      RENOVATE_GITHUB_TOKEN_WARN: "false"
     when:
       event:
         - push