Auto detect version of go required to build tip

[maxatome]

It would avoid the need of a new install-go release each time tip requires a new go version.

curl https://api.github.com/repos/golang/go/contents/src/cmd/dist | jq -r '.[].download_url' | grep '/notgo.*\.go$'

show the URL to retrieve, then the following line should be searched:

^package building_Go_requires_Go_(.+)_or_later$

$1 is, at the time of writing, 1_22_6.

Insert this auto-detection mechanism here ↓

install-go/install-go.pl

Line 89 in 26fb752