Merge branch 'update_renovate_config' into 'main'

Use custom renovate presets

See merge request !137

.gitlab-ci.yml

 include:
   - remote: https://open.greenhost.net/stackspin/stackspin/-/raw/main/.gitlab/ci_templates/helm_package.yml
+  - remote: https://open.greenhost.net/stackspin/stackspin/-/raw/main/.gitlab/ci_templates/dummy_job.yml
   - template: 'Workflows/MergeRequest-Pipelines.gitlab-ci.yml'
 
 stages:
   - lint-helm-chart
   - package-helm-chart
   - release-helm-chart
+  - dummy
 
 variables:
   CHART_NAME: nextcloud-onlyoffice

renovate.json

 {
-  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "extends": [
-    "config:base"
-  ],
-  "bumpVersion": "patch"
+    "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+    "extends": [
+        "local>stackspin/renovate-config"
+    ]
 }