HYPERFLEET-1057 - feat: Fix e2e dockerfile to properly install helm plugins

Author: ma-hill

Dockerfile

@@ -39,6 +39,13 @@ RUN curl -fsSL "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release
 # Install Helm
 RUN curl -fsSL https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 | bash
 
+# Set up Helm environment for plugin installation
+RUN mkdir -p /tmp/helm-home && chmod 755 /tmp/helm-home
+ENV HELM_CACHE_HOME=/tmp/helm-home/.cache/helm \
+    HELM_CONFIG_HOME=/tmp/helm-home/.config/helm \
+    HELM_DATA_HOME=/tmp/helm-home/.local/share/helm \
+    HELM_PLUGINS=/usr/local/share/helm/plugins
+
 # Install Helm plugins - helm-git and helm-diff
 ARG HELM_GIT_VERSION=v1.5.2
 ARG HELM_DIFF_VERSION=3.15.7