fix: check command go and xcaddy in build-static.sh

[ddevsr]

Checking command go:

+ type go
+ echo 'The "go" command must be installed. We strongly recommended installed Homebrew for automatically install Golang'
The "go" command must be installed. We strongly recommended installed Homebrew for automatically install Golang
+ exit 1

Checking command xcaddy:

+ type xcaddy
+ echo 'Something went wrong after running "go install github.com/caddyserver/xcaddy/cmd/xcaddy@latest".'
Something went wrong after running "go install github.com/caddyserver/xcaddy/cmd/xcaddy@latest".
++ go env GOPATH
+ PATH_USER_DOWNLOAD_GO=/root/go/bin
+ '[' -z /root/go/bin ']'
+ echo 'Your user-downloads package in Go = /root/go/bin'
Your user-downloads package in Go = /root/go/bin

[dunglas]

Thank you!