all: pin golang builder layers to go1.18.1
Created by: keegancsmith
We have automation suggesting this. This manually does it, and also ensures all the images get bumped to the latest golang.
ruplacer --go \
'FROM golang:.*-alpine ' \
'FROM golang:1.18.1-alpine@sha256:42d35674864fbb577594b60b84ddfba1be52b4d4298c961b46ba95e9fb4712e8 '
Test Plan: CI