Initial draft of plugin.

.github/README.md

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+# Backstage entity validator WoodpeckerCI Plugin
+
+[![pulls](https://img.shields.io/docker/pulls/kokuwaio/backstage-entity-validator)](https://hub.docker.com/r/kokuwaio/dockerhub-metadata)
+[![size](https://img.shields.io/docker/image-size/kokuwaio/backstage-entity-validator)](https://hub.docker.com/r/kokuwaio/backstage-entity-validator)
+[![dockerfile](https://img.shields.io/badge/source-Dockerfile%20-blue)](https://git.kokuwa.io/woodpecker/backstage-entity-validator/src/branch/main/Dockerfile)
+[![license](https://img.shields.io/badge/License-EUPL%201.2-blue)](https://git.kokuwa.io/woodpecker/backstage-entity-validator/src/branch/main/LICENSE)
+[![prs](https://img.shields.io/gitea/pull-requests/open/woodpecker/backstage-entity-validator?gitea_url=https%3A%2F%2Fgit.kokuwa.io)](https://git.kokuwa.io/woodpecker/backstage-entity-validator/pulls)
+[![issues](https://img.shields.io/gitea/issues/open/woodpecker/backstage-entity-validator?gitea_url=https%3A%2F%2Fgit.kokuwa.io)](https://git.kokuwa.io/woodpecker/backstage-entity-validator/issues)
+
+A [Woodpecker CI](https://woodpecker-ci.org) plugin for [backstage-entity-validator](https://github.com/RoadieHQ/backstage-entity-validator) to lint markdown files.  
+Also usable with Gitlab, Github or locally, see examples for usage.
+
+For more documention see: [git.kokuwa.io/woodpecker/backstage-entity-validator](https://git.kokuwa.io/woodpecker/backstage-entity-validator)

.github/workflows/build.yaml

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+name: Build
+
+on: push
+
+jobs:
+
+  buildx:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@main
+      - uses: docker/setup-qemu-action@master
+      - uses: docker/setup-buildx-action@master
+      - uses: docker/build-push-action@master
+        with:
+          platforms: linux/amd64,linux/arm64

.github/workflows/lint.yaml

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+name: Lint
+
+on: push
+
+jobs:
+
+  renovate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@main
+      - uses: docker://kokuwaio/renovate-config-validator
+
+  markdownlint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@main
+      - uses: docker://kokuwaio/markdownlint
+
+  yamllint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@main
+      - uses: docker://kokuwaio/yamllint
+
+  hadolint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@main
+      - uses: docker://kokuwaio/hadolint
+
+  shellcheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@main
+      - uses: docker://kokuwaio/shellcheck