chore: simplify go generate in examples (#3033)

Author: alexandear

.github/workflows/check-generate

@@ -1,10 +1,8 @@
 #!/bin/bash
 set -exuo pipefail
 export GO111MODULE=on
-echo Generating in root
+echo Generating code
 go generate ./...
-echo Swithcing to _examples and generating again
-cd _examples && go generate ./...
 if [[ $(git --no-pager diff) ]] ; then
     echo "you need to run "go generate ./..." and commit the changes"
     git --no-pager diff

generate_examples.sh

@@ -1,6 +1,6 @@
 package main
 
-//go:generate sh generate_examples.sh
+//go:generate sh -c "cd _examples && go generate ./..."
 
 import (
 	"bytes"