ensure helm installation directory exists and use correct working directory

Author: Trickybrain

hack/e2e/helm.sh

@@ -4,12 +4,18 @@ set -uo pipefail
 
 function helm_install() {
   INSTALL_PATH=${1}
+  
   if [[ ! -e ${INSTALL_PATH}/helm ]]; then
+    mkdir -p ${INSTALL_PATH}
+    pushd ${INSTALL_PATH} > /dev/null || return 1
+    
     curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3
     chmod 700 get_helm.sh
     export USE_SUDO=false
     export HELM_INSTALL_DIR=${INSTALL_PATH}
     ./get_helm.sh
     rm get_helm.sh
+    
+    popd > /dev/null
   fi
 }