Update install-go for 1.18

install/ubuntu/install-go

@@ -1,22 +1,33 @@
-#!/bin/sh
+#!/usr/bin/env bash
 set -e
 
-cd "$(mktemp -d)"
+install_17() { 
+  cd "$(mktemp -d)"
 
-# TODO eventually update this to detect
-os=mac
-arch=amd64
+  os=linux
+  arch=amd64
 
-file=$(curl -sSL  "https://golang.org/dl/?mode=json" \
-  | jq -r '.[0].files[]
-    | select(.os == "'"$os"'")
-    | select(.arch == "'"$arch"'")
-    | .filename')
+  file=$(curl -sSL  "https://golang.org/dl/?mode=json" \
+    | jq -r '.[0].files[]
+      | select(.os == "'"$os"'")
+      | select(.arch == "'"$arch"'")
+      | .filename')
 
-curl -sSLO \
-  -H "Accept: application/vnd.github.v3+json" \
-   "https://dl.google.com/go/$file"
+  curl -sSLO \
+    -H "Accept: application/vnd.github.v3+json" \
+     "https://dl.google.com/go/$file"
 
-sudo tar xzf "$file" -C /usr/local/
+  sudo tar xzf "$file" -C /usr/local/
+
+  echo "Make sure /usr/local/go/bin is in PATH"
+}
+
+upgrade_18() {
+  /usr/local/go/bin/go install golang.org/dl/go1.18beta2@latest
+  "$GOBIN/go1.18beta2" download
+  go install golang.org/x/tools/gopls@latest
+}
+
+#install_17
+upgrade_18
 
-echo "Make sure /usr/local/go/bin is in PATH"