Initial plugin source.

.woodpecker/build.yaml

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+when:
+  event: [manual, push, pull_request]
+  branch: main
+  path: [.woodpecker/build.yaml, .woodpecker/push.yaml, Dockerfile, Dockerfile.dockerignore, entrypoint.sh]
+
+matrix:
+  PLATFORM: [amd64, arm64]
+labels:
+  platform: linux/${PLATFORM}
+
+steps:
+
+  build:
+    image: gcr.io/kaniko-project/executor:v1.23.2-debug
+    commands: /kaniko/executor
+        --context=$CI_WORKSPACE
+        --destination=ci-registry.schnabel.org/kokuwaio/dockerhub-metadata:$CI_PIPELINE_NUMBER-$PLATFORM
+        --reproducible
+        --cache
+        --cache-copy-layers
+        --cache-run-layers
+        --cache-repo=$DOCKER_CACHE/cache/kokuwaio/dockerhub-metadata
+        --insecure-registry=$DOCKER_CACHE
+        --insecure-registry=$DOCKER_MIRROR
+        --registry-mirror=$DOCKER_MIRROR
+        --skip-default-registry-fallback
+        --label=org.opencontainers.image.title="Dockerhub Metadata Plugin"
+        --label=org.opencontainers.image.description="A Woodpecker CI plugin to write metadata to DockerHub repositories."
+        --label=org.opencontainers.image.url=$CI_REPO_URL
+        --label=org.opencontainers.image.documentation=$CI_REPO_URL
+        --label=org.opencontainers.image.source=$CI_REPO_CLONE_URL
+        --label=org.opencontainers.image.vendor=kokuwa.io
+        --label=org.opencontainers.image.licenses=GPL-3.0-or-later

.woodpecker/dockerhub.yaml

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+when:
+  instance: ci.schnabel.org
+  repo: kokuwaio/dockerhub-metadata
+  event: push
+  branch: main
+  path: [.woodpecker/dockerhub.yaml, .woodpecker/build.yaml, .woodpecker/push.yaml, Dockerfile, Dockerfile.dockerignore, entrypoint.sh, README.md]
+
+steps:
+
+  metadata:
+    image: kokuwaio/dockerhub-metadata
+    pull: true
+    settings:
+      repository: kokuwaio/dockerhub-metadata
+      description-short: A Woodpecker CI plugin to write metadata to DockerHub repositories.
+      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: [cron, 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, .hadolint.yaml, "**/Dockerfile"]]
+
+  shellcheck:
+    image: kokuwaio/shellcheck
+    depends_on: []
+    when: [path: [.woodpecker/lint.yaml, "**/*.sh"]]

.woodpecker/push.yaml

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+when:
+  instance: ci.schnabel.org
+  repo: kokuwaio/dockerhub-metadata
+  event: push
+  branch: main
+  path: [.woodpecker/build.yaml, .woodpecker/push.yaml, Dockerfile, Dockerfile.dockerignore, entrypoint.sh]
+
+depends_on: [build]
+skip_clone: true
+
+steps:
+
+  manifest:
+    image: mplatform/manifest-tool:alpine-v2.1.9
+    commands: manifest-tool push from-args
+        --platforms=linux/amd64,linux/arm64
+        --template=ci-registry.schnabel.org/kokuwaio/dockerhub-metadata:$CI_PIPELINE_NUMBER-ARCH
+        --target=ci-registry.schnabel.org/kokuwaio/dockerhub-metadata:$CI_PIPELINE_NUMBER
+
+  docker.io: &push
+    image: quay.io/skopeo/stable:v1.17.0
+    depends_on: [manifest]
+    commands:
+      - echo "$AUTH" > /tmp/auth.json
+      - skopeo copy --all --preserve-digests --dest-precompute-digests
+          docker://ci-registry.schnabel.org/kokuwaio/dockerhub-metadata:$CI_PIPELINE_NUMBER
+          docker://$URL/kokuwaio/dockerhub-metadata:latest
+    environment:
+      URL: docker.io
+      AUTH: {from_secret: DOCKER_IO_AUTH}
+
+  ghcr.io:
+    <<: *push
+    environment:
+      URL: ghcr.io
+      AUTH: {from_secret: GHCR_IO_AUTH}