Initial draft of plugin.

README.md

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+# `renovate-config-validatator` WoodpeckerCI Plugin
+
+[![pulls](https://img.shields.io/docker/pulls/kokuwaio/renovate-config-validatator)](https://hub.docker.com/r/kokuwaio/renovate-config-validatator)
+[![size](https://img.shields.io/docker/image-size/kokuwaio/renovate-config-validatator)](https://hub.docker.com/r/kokuwaio/renovate-config-validatator)
+[![dockerfile](https://img.shields.io/badge/source-Dockerfile%20-blue)](https://git.kokuwa.io/woodpecker/renovate-config-validatator/src/branch/main/Dockerfile)
+[![license](https://img.shields.io/badge/License-EUPL%201.2-blue)](https://git.kokuwa.io/woodpecker/renovate-config-validatator/src/branch/main/LICENSE)
+[![prs](https://img.shields.io/gitea/pull-requests/open/woodpecker/renovate-config-validatator?gitea_url=https%3A%2F%2Fgit.kokuwa.io)](https://git.kokuwa.io/woodpecker/renovate-config-validatator/pulls)
+[![issues](https://img.shields.io/gitea/issues/open/woodpecker/renovate-config-validatator?gitea_url=https%3A%2F%2Fgit.kokuwa.io)](https://git.kokuwa.io/woodpecker/renovate-config-validatator/issues)
+
+A [WoodpeckerCI](https://woodpecker-ci.org) plugin for [Renovate configuration validation](https://docs.renovatebot.com/config-validation/).  
+Also usable with Gitlab, Github or locally, see examples for usage.
+
+## Features
+
+- preconfigure Renovate parameters
+- searches for Renovate files recursive
+- runnable with local docker daemon
+
+## Example
+
+Woodpecker:
+
+```yaml
+steps:
+  renovate:
+    image: kokuwaio/renovate-config-validator
+    settings:
+      strict: false
+    when:
+      event: pull_request
+      path: renovate.json
+```
+
+Gitlab:
+
+```yaml
+kokuwaio/renovate-config-validator:
+  stage: lint
+  image: kokuwaio/renovate-config-validator
+  variables:
+    PLUGIN_STRICT: false
+  rules:
+    - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+      changes: [renovate.json]
+```
+
+CLI:
+
+```bash
+docker run --rm --volume=$(pwd):$(pwd):ro --workdir=$(pwd) kokuwaio/renovate-config-validator
+```
+
+## Settings
+
+| Settings Name  | Environment     | Default | Description                                                    |
+| -------------- | --------------- | ------- | -------------------------------------------------------------- |
+| [strict](https://docs.renovatebot.com/config-validation/#strict-mode) | PLUGIN_STRICT | `true` | Fail if a scanned config needs migration. |
+
+## Alternatives
+
+| Image                                                                                                       | Comment                           | amd64 | arm64 |
+| ----------------------------------------------------------------------------------------------------------- | --------------------------------- |:-----:|:-----:|
+| [kokuwaio/renovate-config-validator](https://hub.docker.com/r/kokuwaio/renovate-config-validator)           | Woodpecker plugin                 | [![size](https://img.shields.io/docker/image-size/kokuwaio/renovate-config-validator?arch=amd64&label=)](https://hub.docker.com/r/kokuwaio/renovate-config-validator)           | [![size](https://img.shields.io/docker/image-size/kokuwaio/renovate-config-validator?arch=arm64&label=)](https://hub.docker.com/r/kokuwaio/renovate-config-validator) |
+| [renovate/renovate](https://hub.docker.com/r/renovate/renovate)                                             | not a Woodpecker plugin, official | [![size](https://img.shields.io/docker/image-size/renovate/renovate/latest?arch=amd64&label=)](https://hub.docker.com/r/renovate/renovate)                                      | [![size](https://img.shields.io/docker/image-size/renovate/renovate/latest?arch=arm64&label=)](https://hub.docker.com/r/renovate/renovate) |
+| [rwslinkman/renovatebot-config-validator](https://hub.docker.com/r/rwslinkman/renovatebot-config-validator) | not a Woodpecker plugin, outdated | [![size](https://img.shields.io/docker/image-size/rwslinkman/renovatebot-config-validator?arch=amd64&label=)](https://hub.docker.com/r/rwslinkman/renovatebot-config-validator) | [![size](https://img.shields.io/docker/image-size/rwslinkman/renovatebot-config-validator?arch=arm64&label=)](https://hub.docker.com/r/rwslinkman/renovatebot-config-validator) |