add woodpecker pipeline

.woodpecker/.build.yaml

@@ -0,0 +1,43 @@
+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