ci: add chart testing

.woodpecker/e2e.yml

@@ -0,0 +1,44 @@
+platform: linux/amd64
+
+when:
+  event:
+    - pull_request
+    - push
+  branch:
+    - main
+    - release/**
+
+matrix:
+  k8s:
+    # from https://hub.docker.com/r/kindest/node/tags
+    - v1.25.3 # renovate: kindest
+    - v1.26.2 # renovate: kindest
+
+pipeline:
+  create-cluster:
+    image: alpine:3.17.2
+    pull: true
+    commands:
+      - apk add --no-cache -X http://dl-cdn.alpinelinux.org/alpine/edge/testing kind
+      - export KUBECONFIG=$${CI_WORKSPACE}/kube.config
+      - kind create cluster --name chart-testing --node-image kindest/node:${k8s} --wait 60s
+
+  chart-testing:
+    image: alpine:3.17.2
+    pull: true
+    commands:
+      - apk add --no-cache -X http://dl-cdn.alpinelinux.org/alpine/edge/testing helm kubectl kind
+      - export KUBECONFIG=$${CI_WORKSPACE}/kube.config
+      - kubectl get no -o wide
+
+  delete-cluster:
+    image: alpine:3.17.2
+    pull: true
+    commands:
+      - apk add --no-cache -X http://dl-cdn.alpinelinux.org/alpine/edge/testing kind
+      - export KUBECONFIG=$${CI_WORKSPACE}/kube.config
+      - kind delete cluster--name chart-testing
+    when:
+      status:
+        - success
+        - failure