Add renovate

.forgejo/workflows/renovate.yml

@@ -0,0 +1,53 @@
+name: renovate
+
+on:
+  push:
+    branches:
+      - 'renovate/**' # self-test updates
+  schedule:
+    - cron: '*/30 * * * *'
+
+env:
+  RENOVATE_DRY_RUN: ${{ (github.event_name != 'schedule' && github.ref_name != github.event.repository.default_branch) && 'full' || '' }}
+  RENOVATE_REPOSITORIES: ${{ github.repository }}
+
+jobs:
+  renovate:
+    if: ${{ secrets.RENOVATE_TOKEN != '' }}
+
+    runs-on: docker
+    container:
+      image: 'ghcr.io/visualon/renovate:37.269.3@sha256:4fb1684ec9e10592b6c4726906d353f88097fbb584748150043949a5aa5ca085'
+
+    steps:
+      - uses: actions/cache/restore@0c45773b623bea8c8e75f6c82b208c3cf94ea4f9 # v4.0.2
+        with:
+          path: |
+            .tmp/cache/renovate/repository
+          key: repo-cache-${{ github.run_id }}
+          restore-keys: |
+            repo-cache-
+
+      - run: renovate
+        env:
+          GITHUB_COM_TOKEN: ${{ secrets.RENOVATE_GITHUB_COM_TOKEN }}
+          LOG_LEVEL: debug
+          RENOVATE_BASE_DIR: ${{ github.workspace }}/.tmp
+          RENOVATE_ENDPOINT: ${{ github.server_url }}
+          RENOVATE_PLATFORM: gitea
+          RENOVATE_REPOSITORY_CACHE: 'enabled'
+          RENOVATE_TOKEN: ${{ secrets.RENOVATE_TOKEN }}
+          RENOVATE_GIT_AUTHOR: 'Renovate Bot <forgejo-renovate-action@forgejo.org>'
+
+          GIT_AUTHOR_NAME: 'Renovate Bot'
+          GIT_AUTHOR_EMAIL: 'forgejo-renovate-action@forgejo.org'
+          GIT_COMMITTER_NAME: 'Renovate Bot'
+          GIT_COMMITTER_EMAIL: 'forgejo-renovate-action@forgejo.org'
+
+      - name: Save renovate repo cache
+        if: always() && env.RENOVATE_DRY_RUN == 'true'
+        uses: actions/cache/save@0c45773b623bea8c8e75f6c82b208c3cf94ea4f9 # v4.0.2
+        with:
+          path: |
+            .tmp/cache/renovate/repository
+          key: repo-cache-${{ github.run_id }}