add woodpecker pipeline

.woodpecker/.build.yaml

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+steps:
+- name: docker
+  image: woodpeckerci/plugin-docker-buildx
+  settings:
+    registry: git.ar21.de
+    username:
+      from_secret: REGISTRY_USER
+    password:
+      from_secret: REGISTRY_PASS
+    repo: git.ar21.de/yolokube/grafana-backuper
+    platforms:
+      - linux/amd64
+      - linux/arm64
+    tags:
+      - latest
+      - ${CI_PIPELINE_NUMBER}
+  when:
+    - branch: main
+      event: push
+- name: docker-staging
+  image: woodpeckerci/plugin-docker-buildx
+  settings:
+    registry: git.ar21.de
+    username:
+      from_secret: REGISTRY_USER
+    password:
+      from_secret: REGISTRY_PASS
+    repo: git.ar21.de/yolokube/grafana-backuper
+    platforms:
+      - linux/amd64
+      - linux/arm64
+    tags:
+      - staging
+      - staging-${CI_PIPELINE_NUMBER}
+    dry_run: true
+  when:
+    - branch:
+        exclude: main
+      event: push
+depends_on:
+  - gofmt
+  - lint
+  - vulncheck

.woodpecker/.deploy.yaml

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+skip_clone: true
+steps:
+- name: bump tag in deployment-repo
+  image: git.ar21.de/aaron/kustomize-ci
+  commands:
+    - git clone https://git.ar21.de/yolokube/core-deployments.git deployment-repo
+    - cd deployment-repo/grafana-backuper
+    - kustomize edit set image git.ar21.de/yolokube/grafana-backuper=git.ar21.de/yolokube/grafana-backuper:${CI_PIPELINE_NUMBER}
+  when:
+    - branch: main
+      event: push
+- name: push new tag to deployment-repo
+  image: appleboy/drone-git-push
+  settings:
+    branch: "${CI_PIPELINE_NUMBER}_grafana_backuper"
+    remote: ssh://git@git.ar21.de:2222/yolokube/core-deployments.git
+    path: deployment-repo
+    force: false
+    commit: true
+    commit_message: "GRAFANA BACKUPER: update image tag to ${CI_PIPELINE_NUMBER} (done automagically via Woodpecker pipeline)"
+    ssh_key:
+      from_secret: FORGEJO_SSH_KEY
+  when:
+    - branch: main
+      event: push
+- name: create pull request
+  image: git.ar21.de/tom/push-message-randomizer:latest
+  pull: true
+  settings:
+    gitea_address: https://git.ar21.de
+    gitea_token:
+      from_secret: FORGEJO_API
+    owner: ${CI_REPO_OWNER}
+    repo: core-deployments
+    branch: "${CI_PIPELINE_NUMBER}_grafana_backuper"
+    base_branch: main
+    pr_title: "GRAFANA BACKUPER: update image tag to ${CI_PIPELINE_NUMBER}"
+    pr_body: |
+      ### ℹ Grafana-Backuper image update
+
+      {- random-pr-message -}
+
+      ### Configuration
+
+      📅 **Schedule**: Branch creation - At any time, Automerge - At any time.
+
+      🚦 **Automerge**: Enabled.
+    skip_on_missing_branch: true
+    close_pr_if_empty: true
+    delete_branch_if_pr_empty: true
+    merge_when_checks_succeed: true
+    delete_branch_after_merge: true
+  when:
+    - branch: main
+      event: push
+depends_on:
+  - build

.woodpecker/.gofmt.yaml

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+steps:
+- name: gofmt
+  image: golang:1.22.5
+  commands:
+    - gofmt -l -s .
+  when:
+    - event: push

.woodpecker/.lint.yaml

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+steps:
+- name: golangci-linter
+  image: golangci/golangci-lint:v1.59.1
+  commands:
+    - golangci-lint run ./...
+  when:
+    - event: push

.woodpecker/.vulncheck.yaml

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+steps:
+- name: vuln-check
+  image: golang:1.22.5
+  commands:
+    - go install golang.org/x/vuln/cmd/govulncheck@latest
+    - govulncheck ./...
+  when:
+    - event: push