chore(deps): update docker.io/library/alpine docker tag to v3.21.1

Install helm plugin helm-values-schema-json to generate a values.schema.json from multiple sources.

.drone.yml

@@ -13,7 +13,7 @@ steps:
 - name: markdown lint
   commands:
   - markdownlint *.md
-  image: git.cryptic.systems/volker.raschek/markdownlint:0.42.0
+  image: git.cryptic.systems/volker.raschek/markdownlint:0.43.0
   resources:
     limits:
       cpu: 150
@@ -66,7 +66,7 @@ steps:
   image: git.cryptic.systems/volker.raschek/git:1.4.0
 
 - name: build
-  image: docker.io/plugins/docker:20.18.5
+  image: docker.io/plugins/docker:20.18.6
   settings:
     auto_tag: false
     dockerfile: Dockerfile
@@ -132,7 +132,7 @@ steps:
   image: git.cryptic.systems/volker.raschek/git:1.4.0
 
 - name: build
-  image: docker.io/plugins/docker:20.18.5
+  image: docker.io/plugins/docker:20.18.6
   settings:
     auto_tag: false
     dockerfile: Dockerfile
@@ -198,7 +198,7 @@ steps:
   image: git.cryptic.systems/volker.raschek/git:1.4.0
 
 - name: build
-  image: docker.io/plugins/docker:20.18.5
+  image: docker.io/plugins/docker:20.18.6
   settings:
     auto_tag: false
     dockerfile: Dockerfile
@@ -262,7 +262,7 @@ steps:
   image: git.cryptic.systems/volker.raschek/git:1.4.0
 
 - name: build
-  image: docker.io/plugins/docker:20.18.5
+  image: docker.io/plugins/docker:20.18.6
   settings:
     auto_tag: false
     dockerfile: Dockerfile
@@ -446,7 +446,7 @@ steps:
   image: git.cryptic.systems/volker.raschek/git:1.4.0
 
 - name: build
-  image: docker.io/plugins/docker:20.18.5
+  image: docker.io/plugins/docker:20.18.6
   settings:
     auto_tag: true
     auto_tag_suffix: amd64
@@ -506,7 +506,7 @@ steps:
   image: git.cryptic.systems/volker.raschek/git:1.4.0
 
 - name: build
-  image: docker.io/plugins/docker:20.18.5
+  image: docker.io/plugins/docker:20.18.6
   settings:
     auto_tag: true
     auto_tag_suffix: arm64-v8

Dockerfile

@@ -1,17 +1,18 @@
-FROM docker.io/library/alpine:3.20.3
+FROM docker.io/library/alpine:3.21.1
 
 ARG HELM_VERSION
 
 RUN apk add bash curl git openssl && \
     curl https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 --output /tmp/install.sh
 
-RUN [[ ${HELM_VERSION} == "" ]]; bash /tmp/install.sh
+RUN if [[ -z "${HELM_VERSION+x}" ]]; then bash /tmp/install.sh; fi
-RUN [[ ${HELM_VERSION} != "" ]]; bash /tmp/install.sh --version ${HELM_VERSION}
+RUN if [[ -n "${HELM_VERSION+x}" ]]; then bash /tmp/install.sh --version "${HELM_VERSION}"; fi
 
 RUN rm /tmp/install.sh
 
 # Install additionally helm plugins
 RUN helm plugin install https://github.com/chartmuseum/helm-push.git && \
-    helm plugin install https://github.com/helm-unittest/helm-unittest.git
+    helm plugin install https://github.com/helm-unittest/helm-unittest.git && \
+    helm plugin install https://github.com/losisin/helm-values-schema-json.git
 
 ENTRYPOINT [ "/usr/local/bin/helm" ]

Makefile

@@ -1,6 +1,6 @@
 # HELM_VERSION
 # Only required to install a specifiy version
-HELM_VERSION?=v3.16.2 # renovate: datasource=github-releases depName=helm/helm
+HELM_VERSION?=v3.16.4 # renovate: datasource=github-releases depName=helm/helm
 
 # CONTAINER_RUNTIME
 # The CONTAINER_RUNTIME variable will be used to specified the path to a