chore(ci): add renovate config

Author: lhjt

.github/dependabot.yml

@@ -3,9 +3,7 @@ on:
   push:
     branches:
       - "main"
-  pull_request:
-    branches:
-      - "main"
+      - "renovate/*"
 
 jobs:
   build:
@@ -37,7 +35,7 @@ jobs:
         uses: docker/build-push-action@v2
         with:
           context: ${{ matrix.context }}
-          push: ${{ github.event_name != 'pull_request' }}
+          push: ${{ github.event_name != 'pull_request' && github.ref == 'refs/heads/main' }}
           platforms: linux/amd64
           file: ${{ matrix.context }}/Dockerfile
           tags: |

.github/workflows/docker.yml

@@ -0,0 +1,13 @@
+{
+  "extends": ["config:base"],
+  "lockFileMaintenance": { "enabled": true, "automerge": true },
+  "prHourlyLimit": 2,
+  "labels": ["dependencies"],
+  "packageRules": [
+    {
+      "matchUpdateTypes": ["minor", "patch", "pin", "digest"],
+      "automerge": true,
+      "automergeType": "branch"
+    }
+  ]
+}