hack/ci: remove scripts that are not ci specific

some of the files we had under `hack/ci` were not really just CI
specific - they could be run locally, and have no dependency on a CI at
all, like `e2e.sh` which has been very useful for running the end to end
example that we have to completion even locally.

aside from the removals, this commit adds the `install-binaries` script
that allows us to, with a call to it, install binaries that are relavant
to CI, and assumes that it is running in a CI environment (e.g., see use
of `sudo`).

usage:
	./hack/ci/install-binaries.sh <dependency>

e.g., to install `ko` and `kuttl`:

	./hack/ci/install-binaries.sh ko kuttl

(if you're wondering why make it so that it takes args: this way we can
look at a github workflow and not exactly what is being installed, as
well as let us not install things we don't need in certain workflows,
like how a `validation` workflow would certainly not need the `gh` cli).

Signed-off-by: Ciro S. Costa <ciroscosta@vmware.com>

hack/ci/install-binaries.sh

@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+# Copyright 2021 VMware
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+readonly KO_VERSION=0.8.1
+readonly KUBERNETES_VERSION=1.19.2
+readonly KUTTL_VERSION=0.11.1
+readonly GH_VERSION=2.0.0
+
+main() {
+        cd $(mktemp -d)
+
+        for binary in $@; do
+                case $binary in
+                ko)
+                        install_ko
+                        ;;
+                kubebuilder)
+                        install_kubebuilder
+                        ;;
+                kuttl)
+                        install_kuttl
+                        ;;
+                gh)
+                        install_gh
+                        ;;
+                *) ;;
+                esac
+        done
+
+}
+
+install_ko() {
+        local url=https://github.com/google/ko/releases/download/v${KO_VERSION}/ko_${KO_VERSION}_Linux_x86_64.tar.gz
+
+        curl -sSL $url | tar -xzf -
+        sudo install -m 0755 ./ko /usr/local/bin
+}
+
+install_kubebuilder() {
+        local url=https://storage.googleapis.com/kubebuilder-tools/kubebuilder-tools-${KUBERNETES_VERSION}-linux-amd64.tar.gz
+
+        curl -sSL $url | tar xzf -
+        sudo mv ./kubebuilder /usr/local
+        sudo chown -R $(whoami) /usr/local/kubebuilder
+}
+
+install_kuttl() {
+        local url=https://github.com/kudobuilder/kuttl/releases/download/v${KUTTL_VERSION}/kubectl-kuttl_${KUTTL_VERSION}_linux_x86_64
+
+        curl -sSL -o kubectl-kuttl $url
+        sudo install -m 0755 ./kubectl-kuttl /usr/local/bin
+}
+
+install_gh() {
+	local url=https://github.com/cli/cli/releases/download/v${GH_VERSION}/gh_${GH_VERSION}_linux_amd64.tar.gz
+
+	curl -sSL $url | tar xzf - --strip-components=1
+	sudo mv ./bin/gh /usr/local/bin
+}
+
+main "$@"