docs(README): update documentation

README.md

@@ -3,59 +3,15 @@
 [![Docker Pulls](https://img.shields.io/docker/pulls/volkerraschek/helm)](https://hub.docker.com/r/volkerraschek/helm)
 
 This project contains all sources to build the container image `git.cryptic.systems/volker.raschek/helm`. The primary
-goal of this project is to package the binary `helm` as container image to provide the functionally for CI/CD workflows.
+goal of this project is to package the binary `helm` as container image and provide the functionally for CI/CD workflows.
 The source code of the binary can be found in the upstream project of [helm](github.com/helm/helm).
 
-## drone
-
-Here is an example to lint, package and deploy a chart to chartmuseum via
-`git.cryptic.systems/volker.raschek/helm`.
-
-```yaml
-kind: pipeline
-type: kubernetes
-name: linter
-
-platform:
-  os: linux
-  arch: amd64
-
-steps:
-- name: helm lint
-  commands:
-  - helm lint
-  image: git.cryptic.systems/volker.raschek/helm:latest
-  resources:
-    limits:
-      cpu: 50
-      memory: 50M
-
----
-kind: pipeline
-type: kubernetes
-name: release
-
-platform:
-  os: linux
-
-steps:
-- name: release-helm-chart
-  commands:
-  - helm plugin install https://github.com/chartmuseum/helm-push.git
-  - helm repo add myrepo https://charts.example.com/myrepo
-  - helm package --version ${DRONE_TAG} .
-  - helm cm-push ${DRONE_REPO_NAME}-${DRONE_TAG}.tgz myrepo
-  environment:
-    HELM_REPO_PASSWORD:
-      from_secret: helm_repo_password
-    HELM_REPO_USERNAME:
-      from_secret: helm_repo_username
-  image: git.cryptic.systems/volker.raschek/helm:latest
-  resources:
-    limits:
-      cpu: 50
-      memory: 50M
-trigger:
-  event:
-  - tag
+```bash
+IMAGE_VERSION=3.19.0
+docker run \
+  --rm \
+  --volume "$(pwd):$(pwd)" \
+  --workdir "$(pwd)" \
+    "git.cryptic.systems/volker.raschek/helm:${IMAGE_VERSION}" \
+      version
 ```