Release Helm charts (#302)

closes #261

docs/docs/30-administration/80-kubernetes.md

@@ -4,7 +4,45 @@ Woodpecker does not support Kubernetes natively, but being a container first CI
 
 ## Deploy with HELM
 
-TODO
+### Preparation
+
+```shell
+# create secrets
+kubectl create secret generic woodpecker-secret \
+  --namespace <namespace> \
+  --from-literal=WOODPECKER_SECRET=$(openssl rand -hex 32)
+
+kubectl create secret generic woodpecker-github-client \
+  --namespace <namespace> \
+  --from-literal=WOODPECKER_GITHUB_CLIENT=xxxxxxxx
+
+kubectl create secret generic woodpecker-github-secret \
+  --namespace <namespace> \
+  --from-literal=WOODPECKER_GITHUB_SECRET=xxxxxxxx
+
+# add helm repo
+helm repo add woodpecker https://woodpecker-ci.github.io/
+```
+
+### Woodpecker server
+
+```shell
+# Install
+helm upgrade --install woodpecker-server --namespace <namespace> woodpecker/woodpecker-server
+
+# Uninstall
+helm delete woodpecker-server
+```
+
+## Woodpecker agent
+
+```shell
+# Install
+helm upgrade --install woodpecker-agent --namespace <namespace> woodpecker/woodpecker-agent
+
+# Uninstall
+helm delete woodpecker-agent
+```
 
 ## Deploy with kubectl