Include wget in apk add command

Closes #48978

changelogs/unreleased/48978-fix-helm-installation-on-cluster.yml

+---
+title: Fixes base command used in Helm installations
+merge_request: 20471
+author:
+type: fixed

lib/gitlab/kubernetes/helm/base_command.rb

@@ -18,7 +18,7 @@ module Gitlab
             ALPINE_VERSION=$(cat /etc/alpine-release | cut -d '.' -f 1,2)
             echo http://mirror.clarkson.edu/alpine/v$ALPINE_VERSION/main >> /etc/apk/repositories
             echo http://mirror1.hs-esslingen.de/pub/Mirrors/alpine/v$ALPINE_VERSION/main >> /etc/apk/repositories
-            apk add -U ca-certificates openssl >/dev/null
+            apk add -U wget ca-certificates openssl >/dev/null
             wget -q -O - https://kubernetes-helm.storage.googleapis.com/helm-v#{Gitlab::Kubernetes::Helm::HELM_VERSION}-linux-amd64.tar.gz | tar zxC /tmp >/dev/null
             mv /tmp/linux-amd64/helm /usr/bin/
           HEREDOC

spec/support/shared_examples/helm_generated_script.rb

@@ -6,7 +6,7 @@ shared_examples 'helm commands' do
          ALPINE_VERSION=$(cat /etc/alpine-release | cut -d '.' -f 1,2)
          echo http://mirror.clarkson.edu/alpine/v$ALPINE_VERSION/main >> /etc/apk/repositories
          echo http://mirror1.hs-esslingen.de/pub/Mirrors/alpine/v$ALPINE_VERSION/main >> /etc/apk/repositories
-         apk add -U ca-certificates openssl >/dev/null
+         apk add -U wget ca-certificates openssl >/dev/null
          wget -q -O - https://kubernetes-helm.storage.googleapis.com/helm-v2.7.0-linux-amd64.tar.gz | tar zxC /tmp >/dev/null
          mv /tmp/linux-amd64/helm /usr/bin/
       EOS