Add e2e tests for install command

.github/actions/kustomize/Dockerfile

@@ -0,0 +1,6 @@
+FROM giantswarm/tiny-tools
+
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

.github/actions/kustomize/action.yml

@@ -0,0 +1,9 @@
+name: 'kustomize'
+description: 'A GitHub Action to run kustomize commands'
+author: 'Stefan Prodan'
+branding:
+  icon: 'command'
+  color: 'blue'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'

.github/actions/kustomize/entrypoint.sh

@@ -0,0 +1,12 @@
+#!/bin/sh -l
+
+VERSION=3.5.4
+curl -sL https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize%2Fv${VERSION}/kustomize_v${VERSION}_linux_amd64.tar.gz | tar xz
+
+mkdir -p $GITHUB_WORKSPACE/bin
+cp ./kustomize $GITHUB_WORKSPACE/bin
+chmod +x $GITHUB_WORKSPACE/bin/kustomize
+ls -lh $GITHUB_WORKSPACE/bin
+
+echo "::add-path::$GITHUB_WORKSPACE/bin"
+echo "::add-path::$RUNNER_WORKSPACE/$(basename $GITHUB_REPOSITORY)/bin"