Initial draft of plugin.

.woodpecker/build.yaml

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+when:
+  instance: ci.kokuwa.io
+  repo: woodpecker/markdownlint
+  event: [manual, push, pull_request]
+  branch: main
+  path: [.woodpecker/build.yaml, Dockerfile, Dockerfile.dockerignore, entrypoint.sh]
+
+steps:
+
+  build:
+    image: kokuwaio/buildctl
+    settings: &settings
+      name: registry.kokuwa.io/kokuwaio/markdownlint:ci-${CI_PIPELINE_NUMBER}
+      auth:
+        registry.kokuwa.io:
+          username: {from_secret: kokuwa_io_username}
+          password: {from_secret: kokuwa_io_password}
+      build-args: {NPM_CONFIG_REGISTRY: "${NPM_CONFIG_REGISTRY}"}
+      platform: [linux/amd64, linux/arm64]
+      annotation:
+        org.opencontainers.image.title: Markdownlint WoodpeckerCI Plugin
+        org.opencontainers.image.description: A WoodpeckerCI plugin for markdownlint-cli to lint markdown files.
+        org.opencontainers.image.url: $CI_REPO_URL
+        org.opencontainers.image.documentation: $CI_REPO_URL/README.md
+        org.opencontainers.image.source: $CI_REPO_CLONE_URL
+        org.opencontainers.image.revision: $CI_COMMIT_SHA
+        org.opencontainers.image.vendor: kokuwa.io
+        org.opencontainers.image.licenses: EUPL-1.2
+        org.opencontainers.image.ref.name: kokuwaio/markdownlint
+        org.opencontainers.image.version: 0.45.0
+    when:
+      event: pull_request
+
+  push:
+    image: kokuwaio/buildctl
+    settings:
+      <<: *settings
+      name:
+        - registry.kokuwa.io/kokuwaio/markdownlint:latest
+        - registry.kokuwa.io/kokuwaio/markdownlint:0.45.0
+        - docker.io/kokuwaio/markdownlint:latest
+        - docker.io/kokuwaio/markdownlint:0.45.0
+        - ghcr.io/kokuwaio/markdownlint:latest
+        - ghcr.io/kokuwaio/markdownlint:0.45.0
+      auth:
+        "https://index.docker.io/v1/":
+          username: {from_secret: docker_io_username}
+          password: {from_secret: docker_io_password}
+        ghcr.io:
+          username: {from_secret: ghcr_io_username}
+          password: {from_secret: ghcr_io_password}
+        registry.kokuwa.io:
+          username: {from_secret: kokuwa_io_username}
+          password: {from_secret: kokuwa_io_password}
+    when:
+      event: [manual, push]
+      branch: main

.woodpecker/dockerhub.yaml

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+when:
+  instance: ci.kokuwa.io
+  repo: woodpecker/markdownlint
+  event: [manual, push]
+  branch: main
+  path: [.woodpecker/dockerhub.yaml, README.md]
+
+steps:
+
+  metadata:
+    image: kokuwaio/dockerhub-metadata
+    settings:
+      repository: kokuwaio/markdownlint
+      description-short: A WoodpeckerCI plugin for markdownlint-cli to lint markdown files.
+      categories: [developer-tools, integration-and-delivery]
+      username: {from_secret: dockerhub_username}
+      password: {from_secret: dockerhub_password}

.woodpecker/lint.yaml

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+when:
+  event: [manual, push, pull_request]
+  branch: main
+  path: [.woodpecker/lint.yaml, renovate.json, "**/*.yaml", "**/*.md", "**/*.sh", "**/Dockerfile"]
+
+steps:
+
+  renovate:
+    image: kokuwaio/renovate-config-validator
+    depends_on: []
+    when: [path: [.woodpecker/lint.yaml, renovate.json]]
+
+  yaml:
+    image: kokuwaio/yamllint
+    depends_on: []
+    when: [path: [.woodpecker/lint.yaml, .yamllint.yaml, "**/*.yaml"]]
+
+  markdown:
+    image: kokuwaio/markdownlint
+    depends_on: []
+    when: [path: [.woodpecker/lint.yaml, .markdownlint.yaml, "**/*.md"]]
+
+  dockerfile:
+    image: kokuwaio/hadolint
+    depends_on: []
+    when: [path: [.woodpecker/lint.yaml, "**/Dockerfile"]]
+
+  shellcheck:
+    image: kokuwaio/shellcheck
+    depends_on: []
+    when: [path: [.woodpecker/lint.yaml, "**/*.sh"]]

.woodpecker/test.yaml

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+when:
+  instance: ci.kokuwa.io
+  repo: woodpecker/markdownlint
+  event: [manual, push, pull_request]
+  branch: main
+  path: [.woodpecker/build.yaml, Dockerfile, Dockerfile.dockerignore, entrypoint.sh]
+
+depends_on: [build]
+matrix:
+  PLATFORM: [amd64, arm64]
+labels:
+  platform: linux/${PLATFORM}
+
+steps:
+
+  pr:
+    image: registry.kokuwa.io/kokuwaio/markdownlint:ci-${CI_PIPELINE_NUMBER}
+    when:
+      event: pull_request
+
+  kokuwa.io: &version
+    image: registry.kokuwa.io/kokuwaio/markdownlint
+    pull: true
+    when:
+      event: [manual, push]
+      branch: main
+
+  docker.io:
+    image: docker.io/kokuwaio/markdownlint
+    <<: *version
+
+  ghcr.io:
+    image: ghcr.io/kokuwaio/markdownlint
+    <<: *version