bring back kubectl

bin/compile

@@ -4,6 +4,36 @@ BUILD_DIR=$1
 CACHE_DIR=$2
 ENV_DIR=$3
 
+KUBECTL_VERSION=$(curl -L -s https://dl.k8s.io/release/stable.txt)
+
+# Download and install kubectl
+echo "Installing kubectl version $KUBECTL_VERSION"
+DOWNLOAD_URL="https://storage.googleapis.com/kubernetes-release/release/$KUBECTL_VERSION/bin/linux/amd64/kubectl"
+mkdir -p "$CACHE_DIR/kubectl/$KUBECTL_VERSION"
+KUBECTL_CACHE_FILE="$CACHE_DIR/kubectl/$KUBECTL_VERSION/kubectl"
+
+if [ ! -e "$KUBECTL_CACHE_FILE" ]; then
+  echo "Downloading kubectl"
+  curl --silent --show-error -o "$KUBECTL_CACHE_FILE" "$DOWNLOAD_URL"
+  chmod +x "$KUBECTL_CACHE_FILE"
+else
+  echo "Restoring cached kubectl binary"
+fi
+
+mkdir -p "$BUILD_DIR/.heroku/kubectl/bin"
+cp -a "$KUBECTL_CACHE_FILE" "$BUILD_DIR/.heroku/kubectl/bin/"
+
+mkdir -p "$BUILD_DIR/.profile.d"
+cat > "$BUILD_DIR/.profile.d/kubectl.sh" <<'KUBECTL'
+export PATH="$HOME/.heroku/kubectl/bin:$PATH"
+
+if [ ! -z "$KUBECONFIG_BASE64" ]; then
+  mkdir -p "$HOME/.kube"
+  echo "$KUBECONFIG_BASE64" | base64 -d > "$HOME/.kube/config"
+fi
+KUBECTL
+
+
 # Download and install helm
 
 HELM_VERSION="v3.10.1"