chore(deps): update git.cryptic.systems/volker.raschek/helm docker tag to v3.15.0

Reviewed-on: #39

.drone.yml

@@ -3,15 +3,21 @@ kind: pipeline
 type: kubernetes
 name: linter
 
+clone:
+  disable: true
+
 platform:
   os: linux
   arch: amd64
 
 steps:
+- name: clone
+  image: git.cryptic.systems/volker.raschek/git:1.3.1
+
 - name: helm lint
   commands:
   - helm lint
-  image: docker.io/volkerraschek/helm:3.9.0
+  image: git.cryptic.systems/volker.raschek/helm:3.15.0
   resources:
     limits:
       cpu: 150
@@ -20,7 +26,7 @@ steps:
 - name: markdown lint
   commands:
   - markdownlint *.md
-  image: docker.io/volkerraschek/markdownlint:0.31.1
+  image: git.cryptic.systems/volker.raschek/markdownlint:0.40.0
   resources:
     limits:
       cpu: 150
@@ -29,7 +35,7 @@ steps:
 - name: helm template
   commands:
   - helm template .
-  image: docker.io/volkerraschek/helm:3.9.0
+  image: git.cryptic.systems/volker.raschek/helm:3.15.0
   resources:
     limits:
       cpu: 150
@@ -37,15 +43,17 @@ steps:
 
 - name: email-notification
   environment:
-    PLUGIN_HOST:
+    SMTP_FROM_ADDRESS:
+      from_secret: smtp_from_address
+    SMTP_FROM_NAME:
+      from_secret: smtp_from_name
+    SMTP_HOST:
       from_secret: smtp_host
-    PLUGIN_USERNAME:
+    SMTP_USERNAME:
       from_secret: smtp_username
-    PLUGIN_PASSWORD:
+    SMTP_PASSWORD:
       from_secret: smtp_password
-    PLUGIN_FROM:
-      from_secret: smtp_mail_address
-  image: docker.io/drillster/drone-email:latest
+  image: git.cryptic.systems/volker.raschek/drone-email:0.1.5
   resources:
     limits:
       cpu: 150
@@ -65,10 +73,16 @@ kind: pipeline
 type: kubernetes
 name: release
 
+clone:
+  disable: true
+
 platform:
   os: linux
 
 steps:
+- name: clone
+  image: git.cryptic.systems/volker.raschek/git:1.3.1
+
 - name: release-helm-chart
   commands:
   - helm repo add volker.raschek https://charts.cryptic.systems/volker.raschek
@@ -79,7 +93,7 @@ steps:
       from_secret: helm_repo_password
     HELM_REPO_USERNAME:
       from_secret: helm_repo_username
-  image: docker.io/volkerraschek/helm:3.9.0
+  image: git.cryptic.systems/volker.raschek/helm:3.15.0
   resources:
     limits:
       cpu: 150

renovate.json

@@ -1,7 +1,5 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "automergeStrategy": "merge-commit",
-  "automergeType": "pr",
   "assignees": [ "volker.raschek" ],
   "labels": [ "renovate" ],
   "packageRules": [