feat: add script to setup env test

scripts/setup_envtest_bins.sh

@@ -0,0 +1,59 @@
+set -eu
+
+# */
+# To use envtest is required etcd, kube-apiserver and kubetcl binaries in the testbin directory.
+# This script will perform this setup for linux or mac os x envs.
+# */
+
+K8S_VER=v1.18.2
+ETCD_VER=v3.4.3
+OS=$(uname -s | tr '[:upper:]' '[:lower:]')
+ARCH=$(uname -m | sed 's/x86_64/amd64/')
+ETCD_EXT="tar.gz"
+TESTBIN_DIR=testbin
+
+# Do nothing if the $TESTBIN_DIR directory exist already.
+if [ ! -d $TESTBIN_DIR ]; then
+  mkdir -p $TESTBIN_DIR
+
+  # install etcd binary
+  # the extension for linux env is not equals for mac os x
+  if [ $OS == "darwin" ]; then
+     ETCD_EXT="zip"
+  fi
+  [[ -x ${TESTBIN_DIR}/etcd ]] || curl -L https://storage.googleapis.com/etcd/${ETCD_VER}/etcd-${ETCD_VER}-${OS}-${ARCH}.${ETCD_EXT} | tar zx -C ${TESTBIN_DIR} --strip-components=1 etcd-${ETCD_VER}-${OS}-${ARCH}/etcd
+
+  # install kube-apiserver and kubetcl binaries
+  if [ $OS == "darwin" ]
+  then
+    # kubernetes do not provide the kubernetes-server for darwin, 
+    # In this way, to have the kube-apiserver is required to build it locally
+    # if the project is cloned locally already do nothing
+    if [ ! -d $GOPATH/src/k8s.io/kubernetes ]; then
+	  git clone https://github.com/kubernetes/kubernetes $GOPATH/src/k8s.io/kubernetes --depth=1 -b v1.18.2
+    fi
+
+    # if the kube-apiserve is built already then, just copy it
+    if [ ! -f $GOPATH/src/k8s.io/kubernetes/_output/local/bin/darwin/amd64/kube-apiserver ]; then
+	  DIR=$(pwd)
+	  cd $GOPATH/src/k8s.io/kubernetes
+	  # Build for linux first otherwise it won't work for darwin - :(
+	  export KUBE_BUILD_PLATFORMS="linux/amd64"
+	  make WHAT=cmd/kube-apiserver
+	  export KUBE_BUILD_PLATFORMS="darwin/amd64"
+	  make WHAT=cmd/kube-apiserver
+	  cd ${DIR}
+    fi
+    cp $GOPATH/src/k8s.io/kubernetes/_output/local/bin/darwin/amd64/kube-apiserver $TESTBIN_DIR/
+
+    # setup kubectl binary
+    curl -LO https://storage.googleapis.com/kubernetes-release/release/${K8S_VER}/bin/darwin/amd64/kubectl
+    chmod +x kubectl
+    mv kubectl $TESTBIN_DIR/
+
+    # allow run the tests without the Mac OS Firewall popup shows for each execution
+    codesign --deep --force --verbose --sign - ./${TESTBIN_DIR}/kube-apiserver
+  else
+    [[ -x testbin/kube-apiserver && -x ${TESTBIN_DIR}/kubectl ]] || curl -L https://dl.k8s.io/${K8S_VER}/kubernetes-server-${OS}-${ARCH}.tar.gz | tar zx -C ${TESTBIN_DIR} --strip-components=3 kubernetes/server/bin/kube-apiserver kubernetes/server/bin/kubectl
+  fi
+fi