fix(drone): adapt CI pipelines

.drone.yml

@@ -1,7 +1,7 @@
 ---
 kind: pipeline
 type: kubernetes
-name: linter
+name: Linters
 
 clone:
   disable: true
@@ -11,31 +11,13 @@ platform:
   arch: amd64
 
 steps:
-- name: clone
+- name: clone repository
   image: git.cryptic.systems/volker.raschek/git:1.4.0
 
 - name: helm lint
   commands:
   - helm lint
-  image: git.cryptic.systems/volker.raschek/helm:3.16.4
+  image: git.cryptic.systems/volker.raschek/helm:3.16.3
-  resources:
-    limits:
-      cpu: 50
-      memory: 50M
-
-- name: markdown lint
-  commands:
-  - markdownlint *.md
-  image: git.cryptic.systems/volker.raschek/markdownlint:0.43.0
-  resources:
-    limits:
-      cpu: 150
-      memory: 150M
-
-- name: helm template
-  commands:
-  - helm template .
-  image: git.cryptic.systems/volker.raschek/helm:3.16.4
   resources:
     limits:
       cpu: 150
@@ -71,7 +53,119 @@ trigger:
 ---
 kind: pipeline
 type: kubernetes
-name: release
+name: Unit tests
+
+clone:
+  disable: true
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: clone repository
+  image: git.cryptic.systems/volker.raschek/git:1.4.0
+
+- name: helm unittest
+  commands:
+  - helm unittest --strict --file 'unittests/**/*.yaml' ./
+  image: git.cryptic.systems/volker.raschek/helm:3.16.3
+  resources:
+    limits:
+      cpu: 150
+      memory: 150M
+
+- name: email-notification
+  environment:
+    SMTP_FROM_ADDRESS:
+      from_secret: smtp_from_address
+    SMTP_FROM_NAME:
+      from_secret: smtp_from_name
+    SMTP_HOST:
+      from_secret: smtp_host
+    SMTP_USERNAME:
+      from_secret: smtp_username
+    SMTP_PASSWORD:
+      from_secret: smtp_password
+  image: git.cryptic.systems/volker.raschek/drone-email:0.1.5
+  resources:
+    limits:
+      cpu: 150
+      memory: 150M
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  event:
+    exclude:
+    - tag
+
+---
+kind: pipeline
+type: kubernetes
+name: Generate, compare and lint README.md
+
+clone:
+  disable: true
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: clone repository
+  image: git.cryptic.systems/volker.raschek/git:1.4.0
+
+- name: execute NPM modules
+  commands:
+  - npm install
+  - npm run readme:link
+  - npm run readme:lint
+  - npm run readme:parameters
+  image: docker.io/library/node:23.3.0-alpine
+  resources:
+    limits:
+      cpu: 150
+      memory: 150M
+
+- name: detect diff
+  commands:
+  - git diff --exit-code --name-only README.md
+  image: git.cryptic.systems/volker.raschek/git:1.4.0
+
+- name: email-notification
+  environment:
+    SMTP_FROM_ADDRESS:
+      from_secret: smtp_from_address
+    SMTP_FROM_NAME:
+      from_secret: smtp_from_name
+    SMTP_HOST:
+      from_secret: smtp_host
+    SMTP_USERNAME:
+      from_secret: smtp_username
+    SMTP_PASSWORD:
+      from_secret: smtp_password
+  image: git.cryptic.systems/volker.raschek/drone-email:0.1.5
+  resources:
+    limits:
+      cpu: 150
+      memory: 150M
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  event:
+    exclude:
+    - tag
+
+---
+kind: pipeline
+type: kubernetes
+name: Release
 
 clone:
   disable: true
@@ -80,20 +174,20 @@ platform:
   os: linux
 
 steps:
-- name: clone
+- name: clone repository
   image: git.cryptic.systems/volker.raschek/git:1.4.0
 
 - name: release-helm-chart
   commands:
-  - helm repo add volker.raschek https://charts.cryptic.systems/volker.raschek
+  - helm repo add prometheus-exporters https://charts.cryptic.systems/prometheus-exporters
   - helm package --version ${DRONE_TAG} .
-  - helm cm-push ${DRONE_REPO_NAME%-charts}-${DRONE_TAG}.tgz volker.raschek
+  - helm cm-push ${DRONE_REPO_NAME%-charts}-${DRONE_TAG}.tgz prometheus-exporters
   environment:
     HELM_REPO_PASSWORD:
       from_secret: helm_repo_password
     HELM_REPO_USERNAME:
       from_secret: helm_repo_username
-  image: git.cryptic.systems/volker.raschek/helm:3.16.4
+  image: git.cryptic.systems/volker.raschek/helm:3.16.3
   resources:
     limits:
       cpu: 150