fix: install helm via installation script

Dockerfile

@@ -2,10 +2,15 @@ FROM docker.io/library/alpine:3.14
 
 ARG HELM_VERSION
 
-COPY install.sh /install.sh
-RUN VERSION=${HELM_VERSION} /install.sh
+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 [[ ${HELM_VERSION} != "" ]]; bash /tmp/install.sh --version ${HELM_VERSION}
+
+RUN rm /tmp/install.sh
 
 # Install additionally cm-push plugin
 RUN helm plugin install https://github.com/chartmuseum/helm-push.git
 
-ENTRYPOINT [ "/usr/bin/helm" ]
+ENTRYPOINT [ "/usr/local/bin/helm" ]

install.sh

@@ -1,38 +0,0 @@
-#!/bin/sh
-
-set -xe
-
-BASE_URL=https://get.helm.sh
-
-if [ -z ${VERSION+x} ]; then
-  echo ${VERSION} not defined
-  exit 1
-fi
-
-case `uname -m` in
-  x86_64)
-    ARCH=amd64
-  ;;
-  armv7l)
-    ARCH=arm
-  ;;
-  aarch64)
-    ARCH=arm64
-  ;;
-  ppc64le)
-    ARCH=ppc64le
-  ;;
-  s390x)
-    ARCH=s390x
-  ;;
-  *)
-    echo "un-supported arch, exit ..."
-    exit 1
-  ;;
-esac
-
-apk add --update --no-cache wget git
-wget ${BASE_URL}/helm-${VERSION}-linux-${ARCH}.tar.gz -O - | tar -xz
-mv linux-${ARCH}/helm /usr/bin/helm
-chmod +x /usr/bin/helm
-rm -rf linux-${ARCH}