add script to download k8s tooling with back-off mechanism

make fetch timeout configurable

add CNG image building pipeline

.gitlab/ci/cng-images.yml

@@ -0,0 +1,18 @@
+# Used by GitLab: https://gitlab.com/gitlab-org/gitlab/blob/master/.gitlab-ci.yml
+.gitlab-cng-matrix:
+  # image: registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.7.patched-golang-1.14-git-2.31-lfs-2.9-chrome-89-node-14.15-yarn-1.22-postgresql-11-graphicsmagick-1.3.36
+  variables:
+    LFS: '2.9'
+    CHROME: '89'
+    NODE: '14.15'
+    YARN: '1.22'
+    GRAPHICSMAGICK: '1.3.36'
+    POSTGRESQL: '11'
+    RUBY: '2.7.patched'
+    GIT: '2.31'
+    GOLANG: '1.14'
+
+gitlab-cng push:
+  extends:
+    - .gitlab-cng-matrix
+    - .build_and_deploy_custom

scripts/install-k8s-tooling

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+export KUBECTL_VERSION=${KUBECTL_VERSION:-"v1.19.7"}
+export HELM_VERSION=${HELM_VERSION:-"3.3.1"}
+export FETCH_TIMEOUT=${FETCH_TIMEOUT:-"5m"}
+
+_fetch_helm(){
+    curl -Ls https://get.helm.sh/helm-v${HELM_VERSION}-linux-amd64.tar.gz | tar zxf - \
+        && chmod +x linux-amd64/helm \
+        && mv linux-amd64/helm /usr/local/bin/ \
+        && rm -rf linux-amd64/
+}
+
+fetch_helm(){
+    until _fetch_helm ; do sleep 30; done
+}
+
+export -f fetch_helm _fetch_helm
+timeout ${FETCH_TIMEOUT} bash -xc fetch_helm
+
+_fetch_kubectl(){
+    curl -LsO https://storage.googleapis.com/kubernetes-release/release/${KUBECTL_VERSION}/bin/linux/amd64/kubectl \
+        && chmod +x kubectl \
+        && mv kubectl /usr/local/bin/kubectl
+}
+
+fetch_kubectl(){
+    until _fetch_kubectl ; do sleep 30 ; done
+}
+
+export -f fetch_kubectl _fetch_kubectl
+timeout ${FETCH_TIMEOUT} bash -xc fetch_kubectl