Initial draft of plugin.

README.md

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+# Hadolint WoodpeckerCI Plugin
+
+[![pulls](https://img.shields.io/docker/pulls/kokuwaio/hadolint)](https://hub.docker.com/r/kokuwaio/hadolint)
+[![size](https://img.shields.io/docker/image-size/kokuwaio/hadolint)](https://hub.docker.com/r/kokuwaio/hadolint)
+[![dockerfile](https://img.shields.io/badge/source-Dockerfile%20-blue)](https://git.kokuwa.io/woodpecker/hadolint/src/branch/main/Dockerfile)
+[![license](https://img.shields.io/badge/License-EUPL%201.2-blue)](https://git.kokuwa.io/woodpecker/hadolint/src/branch/main/LICENSE)
+[![prs](https://img.shields.io/gitea/pull-requests/open/woodpecker/hadolint?gitea_url=https%3A%2F%2Fgit.kokuwa.io)](https://git.kokuwa.io/woodpecker/hadolint/pulls)
+[![issues](https://img.shields.io/gitea/issues/open/woodpecker/hadolint?gitea_url=https%3A%2F%2Fgit.kokuwa.io)](https://git.kokuwa.io/woodpecker/hadolint/issues)
+
+A [WoodpeckerCI](https://woodpecker-ci.org) plugin for [hadolint](https://github.com/hadolint/hadolint) to lint Dockerfiles.  
+Also usable with Gitlab, Github or locally, see examples for usage.
+
+## Features
+
+- preconfigure hadolint parameters
+- searches for Dockerfiles recursive
+- runnable with local docker daemon
+
+## Example
+
+Woodpecker:
+
+```yaml
+steps:
+  hadolint:
+    image: kokuwaio/hadolint
+    settings:
+      strict-labels: true
+      format: json
+    when:
+      event: pull_request
+      path: [.hadolint.yaml, "**/Dockerfile"]
+```
+
+Gitlab:
+
+```yaml
+hadolint:
+  stage: lint
+  image: kokuwaio/hadolint
+  variables:
+    PLUGIN_STRICT_LABELS: true
+    PLUGIN_FORMAT: json
+  rules:
+    - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+      changes: [.hadolint.yaml, "**/Dockerfile"]
+```
+
+CLI:
+
+```bash
+docker run --rm --volume=$(pwd):$(pwd):ro --workdir=$(pwd) kokuwaio/hadolint --strict-labels --format=json
+```
+
+## Settings
+
+| Settings Name           | Environment                  | Default | Description                                                     |
+| ----------------------- | ---------------------------- | ------- | --------------------------------------------------------------- |
+| `no-fail`               | PLUGIN_NO_FAIL               | `none`  | Don't exit with a failure status code when any rule is violated |
+| `no-color`              | PLUGIN_NO_COLOR              | `none`  | Don't colorize output                                           |
+| `strict-labels`         | PLUGIN_STRICT_LABELS         | `none`  | Do not permit labels other than specified in `label-schema`     |
+| `disable-ignore-pragma` | PLUGIN_DISABLE_IGNORE_PRAGMA | `none`  | Disable inline ignore pragmas `# hadolint ignore=DLxxxx`        |
+| `failure-threshold`     | PLUGIN_FAILURE_THRESHOLD     | `style` | Exit with failure code only when rules with a severity equal to or above THRESHOLD are violated. Accepted values: error, warning, info, style, ignore, none |
+| `format`                | PLUGIN_FORMAT                | `tty`   | The output format for the results: tty, json, checkstyle, codeclimate, gitlab_codeclimate, gnu, codacy, sonarqube, sarif |
+| `verbose`               | PLUGIN_VERBOSE               | `false` | Enables verbose logging of hadolint's output to stderr          |
+
+## Alternatives
+
+| Image                                                                               | Comment                           | amd64 | arm64 |
+| ----------------------------------------------------------------------------------- | --------------------------------- |:-----:|:-----:|
+| [kokuwaio/hadolint](https://hub.docker.com/r/kokuwaio/hadolint)                     | Woodpecker plugin                 | [![size](https://img.shields.io/docker/image-size/kokuwaio/hadolint?arch=amd64&label=)](https://hub.docker.com/r/kokuwaio/hadolint) | [![size](https://img.shields.io/docker/image-size/kokuwaio/hadolint?arch=arm64&label=)](https://hub.docker.com/r/kokuwaio/hadolint) |
+| [hadolint/hadolint](https://hub.docker.com/r/hadolint/hadolint)                     | not a Woodpecker plugin, official | [![size](https://img.shields.io/docker/image-size/hadolint/hadolint?arch=amd64&label=)](https://hub.docker.com/r/hadolint/hadolint) | [![size](https://img.shields.io/docker/image-size/hadolint/hadolint?arch=arm64&label=)](https://hub.docker.com/r/hadolint/hadolint) |
+| [pipelinecomponents/hadolint](https://hub.docker.com/r/pipelinecomponents/hadolint) | not a Woodpecker plugin           | [![size](https://img.shields.io/docker/image-size/pipelinecomponents/hadolint?arch=amd64&label=)](https://hub.docker.com/r/pipelinecomponents/hadolint) | [![size](https://img.shields.io/docker/image-size/pipelinecomponents/hadolint?arch=arm64&label=)](https://hub.docker.com/r/pipelinecomponents/hadolint) |